This has been obvious from the beginning. There are loads of good reasons to have a dig at Slot, but player recruitment / sales is not one of them. He has nothing to do with it. The lack of balance in the squad is entirely Hughes/Edwards.
This season hasn't played out as they planned, particularly all the defensive injuries, so in reality we don't really know what the plan was. I.e. was it two up top or Isak as the main focus with Ekitike back up? Was Salah going to be managed, or was Frimpong going to be fit and overlap him. Was Kerkez expected to hit the ground running due to prem experience, or has his early struggles surprised them. Etc etc....
All that said, Slot's management of the team has been horrible at times. He's not a leader, a man manager.. but then look at his brief, he's "coach". He's not got the same brief as Klopp.