Yo, this is my account's post statistics, and it's wrong cause I made my first post in 2017.

You're absolutely right, but I think the problem lies elsewhere. My tool relied on Loycev's database. Most likely that date actually refers to your first post but reflects the date loycev's scraper stored the data in the database. I assume this is the case, also because looking at Satoshi's profile the first date of the first post appears to be the same as the date of the last post written
Thanks a lot, I'll give it a read and see if there are any old vote results.