There is no evidence or insinuation that he had any output or pushback or even an overlay of better candidates when these players were signed. Athletic even reported he was initially hesitant to go to Ajax for Antony. Managers need to be supported from this, because their scope is very limited in understanding player recruitment. This is why Pep/Klopp have very limited input on transfers.
Why he didn't say No then? He has a veto power after all. You probably think he is intelligent. He has coached Antony in the past and knows how he plays. His intelligence, albeit limited, might have made him understand that it is better to save 80m that he could spend next season.
I also find very bizarre how you yet again claim that it wasn't players he necessarily wanted. Somehow, the United hierarchy, whom last shopped in Eredivisie when we had a Dutch manager, decided to impose to their new Dutch managers, players who were playing or have played in the past in Eredivisie, quite a few of them players he coached in the past.
Or maybe Occam Razor. The united clown hierarchy asked EtH whom do you want to sign. He said Timber or Martinez as CB, Antony or Gapko as RW, Malacia as LB and FDJ as midfielder, and Erikson as second midfielder in a free (all players who played in Eredivisie, three of which he coached). Then they want and signed Martinez, Antony and Malacia, while making a deal with Barca for FDJ but unable to get him to sign, went and signed Casimiro. Isn't it a coincidence that from all strikers, we chose a Dutch one? Yes, a loan, but there probably were a large number of useless strikers so why it had to be someone EtH knows well?
Then this season we went and signed Onana, whom he coached. And Mount, whom we wanted in loan while in Holland. And Amrabat whom he coached.
I mean, come on.