I think the issue he has with this line of argument is he has spent significant sums of money, some of which were at his behest rather than what looked like a more objective or collaborative process that trusted staff members in recruitment.
Now, that's fine, but then when you start coming out with the tools at your disposal as reasons it doesn't have the same credibility as it would if you walked into a mess (which we were) and had a bunch of players thrown at you Todd Boehly style. To be honest, I don't even have much sympathy for managers in that situation because that is quite literally the main aspect of your job - coach and improve players so irrespective of who the players are, a top coach should get more, demand more, coach and improve players.
Which comes to the next point. So you aren't happy that you don't have the tools to play your exact brand of football. Then okay, but surely you have to be able to see some kind of movement towards it. You are not going to go from shit to playing the ideal football immediately, especially if the players are a big problem as indicated. But you must be seeing a direction. That's under question in the current season.
It looks to me more like he had a decent season last year, some progress but not altogether convincing on the footballing side, but he has hit a complete brick wall with this summer's signings and injuries.