I know but I believe it is a reason on tip of iceberg and there is no coincidence for that investigation against Juventus. It happened after Super League seemed to come closely to activation day. It is also not coincidence that after got the serious punishment, Juventus announced that they left Super League.
From my understanding of the investigation, it happened way earlier than the Super League scandal while the punishments were given near when the scandal broke out[1]. They released the statement arguing that the previous punishment was unfair IIRC, hence why they managed to wiggle out from getting a 15-point deduction[2]. A few months after is when they released another statement saying they would quit the Super League. Regardless of whether there is pressure from Seria A to force them to quit or not, what they did can be investigated publicly since the deal was already done (related to player swap etc). Other leagues seem to be quite direct in that they promise to ban any club from participating in the national league if they join the Super League iirc.
In fact, I doubt that Jose Mourinho will be well received by Premier League clubs because Jose Mourinho's coaching system looks old school and the strategy used for the strongest league feels like it will be impossible to compete easily, previously he was sacked by Chelsea and Manchester United so I think waiting for Newcastle to appoint him as coach is still quite doubtful.
Newcastle can be a good place for him assuming he got the players he wanted. A mid-table club that has a good deal amount of money, assuming they can bypass the FFP somehow. That being said, if the fans are not happy with counter-attacking football and want something more like what they've seen from their current head coach, he probably won't last long unless he brings results like some FA/Carabao Cup. Personally, though, I'd suggest Mourinho join punditry instead. Seems like he can do that job quite well with his persona.
And talking about rankings in the league, Fiorentina is currently in 4th place in the standings and Napoli is in 8th place with a difference of only 3 points. It wasn't a big difference even though the rankings were a little far off.
It is interesting to see that stats-wise they are not that different. 3 points difference is quite fair considering how close their offensive and defensive results are. Not really surprising since clubs other than the top 3 beat each other quite often[3].
[1]
https://www.cbssports.com/soccer/news/juventus-appeal-explained-date-time-whats-next-club-challenges-15-point-deduction-in-serie-a-table/[2]
https://www.juventus.com/en/search?q=press+release[3]
https://www.whoscored.com/Regions/108/Tournaments/5/Seasons/9659/Stages/22143/TeamStatistics/Italy-Serie-A-2023-2024