I'm sorry but this is quite silly, and very made up.
Arteta brought in Miguel Molina, Carlos Cuesta and Inaci Cana among others. Pep had Juanma Lillo and Inigo Dominguez, and also Enzo Maresca. There's literally nothing "old school" about Ten Hag having his backroom staff.
You've come across so lazy in your narrative with a "blargh is dutch yes? Must be a Ten Hag push this is power play!". At least try to put some thought into it.
By the way, the Ibiza story was first leaked by Athletic, who also spoke about Ratcliffe trying to sign Tuchel. Ten Hag also verified that the club went to speak to other managers, so it must be a weird power play if he's open enough to admit his job was massively on the ropes where they went to look for replacements. He's about to sign a contract that will likely have reduced influence on recruitment. There is no power play here. RvN is a good coach as evidenced by his debut year with PSV. He probably tried management too early, but he's an ex player, was a world class striker and knows the club too. If RvN came in under Tuchel no one bats an eye lid. But because it's Ten Hag we have posters literally making shit up. It's so tiresome.