I disagree, but you're entitled to your opinion. He's not sharing a personal experience, but rather replying to someone else's with unsolicited advice on how to better go about getting something that was never asked for in the first place.

Ironically (or maybe not), he's recursively "mansplanined" why "mansplaining" is a term that makes him feel insecure. And I say insecure because of the false dichotomy between having empathy and being "suspicious about a hidden agenda" -- that screams "I feel threatened, so let me explain to you why your approach is wrong".

I don't know that you can call it "unsolicited" when the author published this piece to a blog that has a comment section. "Comment" doesn't exclude advice any more than "Comment" excludes praise, sympathy, or any other message that is in compliance with site guidelines (of which, hers has none).