Hmm, see what you're saying, but I would say they are pretty athletic. They can run all day and press to a high level for 90 minutes. On the ball they're very decisive and sharp. The lack of pace might be more to do with the fact that they dominate possession in 90% of their games.
Open to debate on the Haaland thing. Not sure you can say that someone who is going to end up with 5 great chances and 1-2 goals a game isn't suited to their system. You could equally argue that it's a sign that the system isn't as rigid as everyone likes to think.
That said, I love Pep so I am biased I guess you might be right about how his play would be in theory vs the PL.