The issue I have with Wikipedia is that it’s written for a very broad audience, and therefore interpretation is extremely broad without accompanying study. It’s up to the individual to pursue the sources in depth.
Everyone has their facepalm moment when they learn something new. :)
Thankfully we have a framework for repentance after we read the writings of the sages. There’s some good stuff about lashon hara, and I recommend going direct to the writings of the sage who studied that area extensively. Something might jump out at you.
That’s the thing about repentance: you have to trust the contract is genuine, otherwise you’re going to beat yourself up over transgressions.
From Torah; WHICH contract?