Good for him. Because of this: "My supervisors have a rather superficial understanding of Quantum Computing, and I feel like their idea to start a project in that domain was to a not inconsiderable extent motivated by the prospect of granted research funds , not primarily by their desire to achieve a deeper understanding of quantum stuff." It's always about grant money. Especially with anything that starts with Quant…
And yes, sadly, being successful in asking for funding means pitching the hot topics du jour, which typically don't coincide with the most important or interesting things to do from a scientific point of view. Although asking for grants in quantum computer having zero experience in it does sound a bit too much.
We really need funding to go to people, not projects. Having to pitch specific projects when asking for funding does more harm than good IMO.