The Sissoko thing isn't specific to Aurier though - it's how central midfielders tend to play. Covering their full backs, especially Sissoko. Hojbjerg does the exact same with Reguilon.
He done this with Trippier and likely would have done the same with Kyle Walker if he could actually make the team in central midfield back in 2016-17 - however we have Dembele for this and he done the same job.
I don't think the previous 2 years matter, no. Just like I wouldn't judge Jose Mourinho on his last 2 seasons in management, one of which involved a sacking.
I personally think with Aurier, he had a poor first season and fans just haven't got over it - added to the fact that anyone who's been in the fans bad books before tend to get abuse a bit more when we are actually losing.
Always happens and always will - just like when we are winning Sissoko "Done a great job" when he performs no different in the games we lose, when in which he gets "How on earth is he a professional footballer"