Not really.
Firstly, he only beat Roglic by the margin he did because Roglic had a really bad day. Roglic already has form for fading toward the end of grand tours - just ask Richard Carapaz - and here he did it in spectacular form.
Secondly, Pogacar had been looking stronger than Roglic all race, but didn't have the same level of team support to back him up. Come the ITT where the team-mates weren't there for either of them, and that disadvantage disappeared.
Thirdly, and most importantly, the gap between them really wasn't exceptional by TT standards. If Roglic hadn't fallen apart, Pog would have beaten him by a minute on the day and they'd have been neck and neck on GC. A minute, or even two minutes, really isn't anything to write home about though.
This year's Giro TT: Ganna beat everyone else by 22 seconds, on a course only 15k long.
Last year's world's TT: Dennis beat Evenepoel by over a minute, and everyone else by another minute, on a course that took them only 10 minutes longer to ride than this year's TdF course.
Going back to 1989, that was on a 25k course that didn't even have a hill.
I could go on, but I don't need to do that. A minute or even two minutes' gap on a TT of that length simply isn't enough to warrant suspicion. You can think he's a dirty doper if you like but if you're using the final TT as your reason, it's a very ill-founded one.