tricky situation

I have an interesting dilemma relating to this forum. I would like to get some feedback on it. Also curious if this sort of thing has happened here before.

I've had a hunch for a while that I may know another poster's therapist. This is actually a therapist that I myself have seen for therapy. However, they are not my current therapist. I saw them for several sessions when I was looking for a new therapist but I ultimately ended up going with someone else.

Anyway, my initial hunch was based on prior posts that disclosed some location info plus some identifying traits of the therapist. Now after some more recent posts I am 99% sure that it's the same therapist I saw.

I'm not sure how to proceed. Do I let them know (privately, of course)? Or keep it to myself? This feels tricky because I don't want to be inconsiderate and/or intrusive by sharing this with them...but on the other hand it feels weird to know their therapist and continue reading their posts without sharing that I know. Does that make sense? I've also thought about just leaving the forum but I know I would probably come back to read posts as a lurker, like I did before I joined ...so it doesn't really solve my internal dilemma (which, now that I think about it, is my own issue not theirs- so maybe that answers my question)?

Anyway, I guess I am just asking the opinion of the forum: do you think it would it be considerate/helpful to let this poster know (privately)? Or would that be inconsiderate and possibly intrusive? Has this happened to anyone here before?