If you are going to use opioids it is unquestionably safer to do it with other people while at least some of them are sober-ish. You can't narcan yourself in a solo overdose situation.
And I agree with that. What I don't agree with is that this knowledge should be disseminated in the way it is done on that billboard, with a bunch of people shown having great fun. That is promoting drug use. That sends the wrong message to the kids. You'll have the whole generation growing up thinking any drugs are OK and just part of having fun together. This is horrible.
At the same time the text makes it fairly clear that it is dangerous to use. There's a reason it talks about having narcan and people checking on you, or doing it as a group - my takeaway from the billboard on the whole is that opioids are a scary thing to do with very real risk. It doesn't make me more likely to do fentanyl, but less.
I wouldn't have used that picture myself, but I also am not convinced it by itself is going to lead people to believe that doing fentanyl is a fun activity.