I agree with you, you shouldn't take random person on the Internets word for gospel, like ever.

See my reply to u/gaterop further down too.

My reference is personally seeing recounts from other elections I've lived through, so I don't have fast, easy references at my fingertips. When I was in Alaska there was a close race. Early on the count was ridiculously one sided, so the losing candidate conceded early to save face and throw support behind the opponent (either one was a good choice at the time). Later in the evening they released the updated count and he had actually pulled ahead. They kept counting as the news of the concession was late, and when they found out they announced they were taking back the concession and the counting should continue. The other side said no, you gave up already.

Went to court and it pretty much came out there that if you concede, the count doesn't really matter, at least not in that state because you gave up and quit.

I think it was mid/late 80s when it happened. Regardless, you are right, I'm sure if we researched it every state has those stories through history.