Pogba was never interested in a move to PSG or Real Madrid, and you are correct Raiola said it several times before he died, he will earn €8m a year at Juventus, which is less than what he was earning at Manchester United, he took a pay cut to return to Italy, he would solve Juventus' current midfield problem, which is exactly what they are missing right now.
The rumors are talking about 8+ bonuses, for a max of 10-11 m/€.
Afaik at Manchester, he earns 10 from Manchester and +5 from Adidas.
So since Adidas is also the main sponsor of Juventus, who knows if they will pay the same deal.
Other bonuses were not disclosed in his new Juventus contract; I believe the new Manchester United improved contract was around €25-30/year, so it's still a pay cut even if Adidas still pays him €5m