"React is actually a library, not a framework" is definitely a thing people have said here and there since its inception. It's a distinction that doesn't seem to buy anything in terms of explanatory power or clarity, so I tend to ignore it.
Maybe nowadays there is a set of popular libraries for react so it becomes framework-y?
A framework expects most of your project to be shoehorned into it.
Whether something is one or the other depends on which of the two most users are doing. It's not a very interesting argument, though, because debating semantics is the worst use of the limited time you have on this planet.