I can't speak for @argyle but imo he was thinking along these lines.Tinkering is not what he is doing. That implies he is seeing what might happen if he makes certain changes. Do you think he wanted to win the game? If the answer to that is yes then you have to believe that whatever decision he made on selection was with victory in mind. That is why we have been so successful, not because he tinkered.
tinker - "attempt to repair or improve something in a casual or desultory way, often to no useful effect."
What football tactic book says put your leading scorer defensive mid so that when he isn't doing the job he's not really capable of, and rarely if ever has played there, wants to join the attack he has to do more running than anyone else on the pitch to do that, expending energy he really should be conserving to do the job our DM was not really capable of and was 30 yards behind the play when they scored?
or did he make that up?
regardless of everything else, that looks tinkery to me.