Characters feeding off of information you're giving them isn't infomodding, for sure. Nor would a canonmate or close friend picking up on stuff that others might not be, particularly if you're communicating OOCly about it.

Infomodding is more when a character picks up on so much, so quickly, they're practically reading the other's mind. And they do it constantly. sometimes when it's not even information in the tag, but information that they know because they're familiar with the canon and/or they've read info on the person's journal/app/etc. It's much more extreme than OP is describing.