In fascism, bureaucracy is not use as intended, it’s just a tool. Fascists (like they do with everything) will pick and choose between agencies, rules, and even individual career scientists with families, and use and manipulate them to fit their needs and reach their desired ends. And usually toss them away after.
So yes, in that way they do need it.
I believe that I did originally differentiate between a more “traditional” definition of the term 'conservative," and said that it probably would fit that definition in that it is meant as a check to slow progress slightly so we don’t do insanely stupid shit that puts millions/billions of people in harms way without them even knowing. Not without doing a little math first anyway.
But when it comes to fascists, it’s simply a tool. It will slow/stop when they need it to, and it’ll speed up (or more likely, disappear completely), when they want that. They use it to their own ends.
But that says nothing inherently about bureaucracy itself. Which is something a modern society needs to function properly and safely.