Well, like I said they just are quoting what they "saw on twitter". No links posted from what I saw.
The rational of a first makes sense. We have the Rams 2 and if they were only giving up a 3 might as well keep Peters and let him play then likely get a 3rd round comp pick when he leaves. Who knows though, may be something completely different when compensation is announced.
As far as a new contract, I believe they will sign Peters to a new deal with language inserted to protect them against his behavior issues.