I do think it's debatable. Maybe when cons had 3 ptrs while penals only 2 this wasn't debatable.
Is it a squad with useful and more versatile abilities? Certainly. But the better vet and vehicle-locking satchel snare put the penals on par for AT "strength" in my opinion.
If you use their camo to ambush the "vehicle locking" isn't that much of an issue. Can also use hoorah from ambush to get you in closer. Plus it still has more range than the satchel which offsets that difference a little bit
Better vet isn't very clear cut either. Cons have better survivability with vet, and they have camo to begin with so you should already be taking less fire
I also wouldn't say the abilities are versatile. They're good for 1 thing, killing tanks. Camo helps ambush tanks, vehicle detection tells you exactly when and where to ambush.
AT penals have the massive advantage of being stock. Can't argue against that. But squad to squad the AT cons have quite an edge imo