What do those people mean by "distributed systems"? Are they running a single node server with web app and database on the same node? Is there a load balancer/cache/replica/cluster? If it's 1+ machine, it is distributed.
In your opinion what would qualify as a "distributed system"?
I'm not taking a position on what would qualify as a distributed system, and neither was that the point of my comment.
I believe that when most people talk about "distributed systems", they're talking about some form of microservices architecture, where components of a single system are arbitrarily separated by network requests for nebulous reasons.
In your opinion what would qualify as a "distributed system"?