While I recognize what you're saying here wrt types of programmers and what they're likely to get into, I am not convinced that this doesn't have more to do with relative popularities of terms + the tendency for people who are "into" a subject to explore the subject / be open to explorations of different ways of thinking about the subject.

neither fp or oop are well defined terms in actual usage, more of smears of approaches really. moods almost. We have an awful lot of this sort of thing and often a term will get smeared out into a kind of emotional suggestion + some things that help you avoid types of bugs or accomplish a specific sort of goal.

I don't like this much but for a lot of situations it just means you have to understand things well enough to talk about them without using their name or take the time to establish contexts of meaning w/whoever you are talking to, both of which are good things to have in programmers in general.

That is to say: I think you are correct they have passed through a filter, particularly if they came from an oop background, but I suspect that filter isn't much related to fp vs oop principles as a matter of comparison

edit: just noticed you're the author of the article. here's a thought: the reason you want to avoid mutability can be framed in terms of it causing the number of things you have to hold in your head to very quickly exceed nine, often in ways you may not be aware of unless you have pretty comprehensive knowledge about the runtime characteristics of your entire system's stack.