I think two things can be true at the same time:
1. Pep and his coaching team have done brilliantly to adjust to this crazy season with so many games.
2. Liverpool have been unlucky with injuries, especially to their centre backs.
It’s a bit of a stretch to blame Van Dijk’s injury on Klopp’s over use of him - I think a fairer reading is that he was at the wrong end of a mad challenge by Pickford.
They haven't been unlucky, as the lack of injuries in the previous seasons was incredible.