The big difference for Varane between this season and the previous one is Maguire, and not because of football/skills reasons, but because of roles and leadership.
Varane is one of the most versatile central defenders there is. He can play LCB or RCB, he can play in a 2 or 3 men defense, he can act as a sweeper or as a more aggressive centre back. But that's just on the pitch, he's as versatile when it comes to roles. It took him a couple years after being called up as a kid in the French national team to establish himself as the defensive leader, and a couple more to become the natural leader of the team (despite Lloris keeping the armband because of seniority and being a great leader in his own way), and he has had great success in that leader role.
But he has no problem taking a seat back and being the second in command as he has shown all those years in Madrid playing alongside big leaders with huge personalities like Sergio Ramos or Pepe. And I think that was his mindset coming in last season, he was supposed to play alongside Maguire, the captain of the team, the most expensive defender of all time, the leader of the defense of the English national team, in an English club, he'd obviously be the right hand man. And while I think most of you guys are way too harsh on Maguire as a footballer, it's clear he has no defensive leadership skills (maybe he's a good locker room leader but it's another thing). So Varane found himself having to follow the orders from someone who pretty much had no idea what he was doing.
But this season with Ten Hag making it clear publically that Varane was the boss at the back, it benefited not only him but your whole defense. And I think if Lisandro were to get injured (I hope he wont for you guys, he's pretty amazing), the Varane-Maguire partnership would be very different from last season and if Maguire buys into it, it'd fix a lot of the mistakes in his game.