You have to be ignorant on this topic or a liar to say that Turkey is going to join the EU for the foreseeable future. I accept that you might be ignorant (no shame in that), but the people that created that campaign material were lying because they did know better.
Even back in 2015 it was pretty clear that Turkey was probably never going to join the EU - at least a generation off if ever. They have nominally been trying to join since the 1980s and its going nowhere in large part because of a lack of progress on Turkey's side and also signficant skepticism of further expansion on the EU side.
There is a lot of talk about Ukraine joining for instance, but its far from clear despite the expressed political will on both sides that it will ever happen for various reasons. These include the question of Ukraine meeting entry thresholds or EU members willing to absorb a member the size of Ukraine and the funding implications its entry would bring. Despite that, Ukraine is signficantly more likely to join than Turkey was in 2016.
No because there is nothing wrong with the EU telling Turkey these are the entry standards for membership. Turkey didn't meet those standards and were backsliding on lots of issues esp around human rights and political/media freedom. It also had unreasolved territorial issues with other member states namely Greece which completely block ascension.
Yes and No because the politics of this are complex both within the EU and in Turkey. Focusing just on the EU side:
There are lots of voices in the EU that want to see Turkey join the EU. Its an important (if sometimes difficult) NATO partner, and in many ways esp in its cities, a very European nation in its history and culture (Istanbul and Antalya are both great hoilday destinations btw - I recommend). We have a lot in common with Turkey. Its also a large econmy and an important bridge to central asia and the middle east. This is why Turkey was accepted as a candidate in the first place.
However there were real voices against Turkey's membership motivated from concerns over the impact to the balance of power within the EU, funding implication for bringing in such a large member with lots of regional depravation, doubts over Turkey ever meeting entry requirements, and the more ugly outright islamophobia and racism.
If you want to cut to the chase then yes the EU kinda sorta lied to Turkey because its officals know these facts, but Turkey's officals themselves are in on it for their own internal politics which I won't get into in part because I know much less about it. It suited both nations to play this ascension dance and technically it was possible that conditions might change and people's minds might be changed. Its a process not a binary.
> If you want to cut to the chase then yes the EU kinda sorta lied to Turkey because its officals know these facts, but Turkey's officals themselves are in on it for their own internal politics which I won't get into in part because I know much less about it.
An important missing piece is that not that long ago, when it officially became candidate, Turkey was seen as a secular, progressive state in the Middle East. Its recent backsliding into autocratic medieval theocracy pretty much ended the idea that Turkey would join without serious changes in government policy and constitution.
Even back in 2015 it was pretty clear that Turkey was probably never going to join the EU - at least a generation off if ever. They have nominally been trying to join since the 1980s and its going nowhere in large part because of a lack of progress on Turkey's side and also signficant skepticism of further expansion on the EU side.
There is a lot of talk about Ukraine joining for instance, but its far from clear despite the expressed political will on both sides that it will ever happen for various reasons. These include the question of Ukraine meeting entry thresholds or EU members willing to absorb a member the size of Ukraine and the funding implications its entry would bring. Despite that, Ukraine is signficantly more likely to join than Turkey was in 2016.