You, and many others, are very wrong in this. If there was a proper structure in place, Ten Hag either wouldn't be signed as a manager in the first place (because the team absolutely doesn't fit his style of play, and that's super visible from the start), or they would've backed him with signings that would fit his style of play, for the positions they need signings. Expecting a manager to make DoF decisions is stupid, thinking all these signings were 100% the idea of ten Hag is another mistake in thinking.
People who say Ten Hag paid 90 million for Antony and therefore needs to be removed honestly don't know how football clubs are run.
He probably said he'd like Antony, then people higher up pay big money for him, leaving him no money to address other important positions.