For the haptic feedback? No, it's a mechanical screw with a physical stop to keep it from turning at the right time. You can see it disassembled here. The sensor may be a hall effect sensor, I don't actually know, but once again, the patent isn't about drift.

Watching that video gave me flashbacks about how much of a pain in the ass these are to disassemble, too, which is why I have several of these with stick drift issues just gathering dust instead of actually repairing them.

No, I read the whole thing, including that line, but that's entirely editorializing from the reporter. The quotes from the actual patent are pretty clear, machine translation word soup aside.

You being nitpicky made me go dig up the full patent, which makes it even clearer: "(...) The intensity of the magnetic field can be designated from the application. Thus, it is possible to perform flexible control in accordance with the application".

I don't blame the commenters for not going that extra step, though, that's just me being fastidious. I do blame the reporters focusing on stick drift because mah clicks for not reading the patent properly, though.

EDIT: For what it's worth, I find the idea of a stick being full of ferrofluid or whatever else they're using for this to be... likely finicky and potentially messy and fragile, depending on how much you need in there to make it work properly. This sounds intriguing and weirdly high-tech, but if you made me bet I wouldn't feel comfortable putting money on this showing up on a Switch 2 just yet. Could be wrong, though.