Those two are special cases -- Garnacho if / when he renews will get a lot more. Hojlund was a young player and again paid an appropriate wage that reflects that he's not starter level for United immediately.
I don't think 100k p/w esp. for a striker is a lot but open to some amount of pushback based on data:
https://www.spotrac.com/epl
e.g., Tomiyasu is on 100k p/w and Solanke is also on 100k p/w.
At the very least, it won't prove to be a stumbling block if we chose to sell him / loan him. Most PL clubs can pay that for a striker.