I wouldn't say Salah's done nothing of note since his last update... he''s got 13 PL goals this season. I woulda questioned this upgrade too if it didn't bring him into line with Auba (who likely kept his rating due only to his PL goals), & Kane (who also hasn't won a trophy). Kane won the Golden Boot but if we're talking individual accolades since the last update then Salah has won African POTY, was 3rd in Fifa POTY, & 6th in the Ballon d'Or, & those placings coulda been bettered if not for injury and playing for a hopeless Egypt side. IMO he won't get to 96 if LFC win the league, that would be too far. VvD should increase in that case though yeah, & rightfully so as he's LFC's best player & 1 of the world's best defenders anyway.
Tbf VvD was under rated for a while due to Southampton's cap etc so he's been lagging behind what he should be, now he's caught up. It's deserved as well, the guy is getting a lot of buzz for POTY despite being a defender. On form he & Koulibaly are the world's best CBs IMO so it makes sense to see them both on at least 93.
I'd say Alisson to 93 already was the LFC rating that was too soon considering his last update was + 2, him & Ederson should be the same.