It would be fantastic if that was the case, but I think you're reading too much into this.
The French investigation, which has been going on for at least six years*, appears to be taking in a very wide range of accusations, presumably in connection with a number of transfers and other transactions. If there was any discrepancy with pertinent Sala paperwork, you'd have hoped that City's legal team would have flagged that to the FA/FIFA/CAS already.
*see this article from 3 years ago: "The national financial prosecutor’s office in 2017 also opened an investigation into suspicions of tax fraud targeting Waldemar Kita, the president of FC Nantes." : -
Ouest-France report that police officers on Tuesday undertook a search of the club's training ground at la Jonelière as part of an investigation into agent
www.getfootballnewsfrance.com