That a rider would be so dominant is suspicious, yes. But there's context to it; he and Roglic were head and shoulders favourites before the race, anyone who might have been a genuine opponent either didn't start, or crashed out of contention. Imagine the 2010 Tour if one of Andy/Contador had crashed out, or just look at 2014 Nibali riding with no Froome/Contador, or Delgado in 88 with Hinault retired, Lemond out of action and Roche injured.I'm amazed anyone with knowledge of the sport thinks Pogacar's racing the last three weeks was not suspicious. Too many red flags.
With Armstrong, even with him running supposedly the most sophisticated, omerta doping operation in the sport's history, there was still plumes of smoke emanating, there was a constant stream of hearsay from within the USPS/Disco/Astana camp. As has been said on here, so many dopers these days are caught, not by the testing, but by police, by investigations, by reporting.
If there is something going on at UAE (and for every sign that it is, eg Pogi's form, there's a sign that it isn't eg Hirschi) then sooner or later info about it will start leaking to the public.
Also, don't forget, this is the team that 2 years ago provided their riders with an experimental sports drink that led to them all gaining 2-3kg during the Tour. I'm sure they can do some things well, but running a doping program, that is clearly way above what other teams with more resources can run, and keeping it quiet, is probably very, very hard.