The thing with Pochettino is that he built a Southampton team based on them running more than anyone else. At his peak at Spurs that was probably also true (or at least close to true). The front 3 with Eriksen, Alli and Kane never stopped running. Eriksen back then covered a ridiculous amount of ground. Walker and Rose basically played against the oppostion's full backs when in possession and against their wingers when defending. Back in 16/17 our full backs almost played every other game because it was so demanding.
If he can get that PSG team to just run more than everyone else than obviously they will be extremely good.
If he has to outsmart managers tactically I just don't see it. Not that I think he is completely useless tactically, and if he can reach a CL final with Spurs he can obviously win it with PSG, but I would be surprised (not shocked) if he is a long term success at PSG.