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In that thread image: "mystery thing" haha I like that.
What I have, namely a Fatty Ds are waaaaaaaaaaaaaay more basic. Open up, plonk in the spring/elastomer, plonk air damper on top, screw in top cap with lots of locktite, done. Unless something is leaking. You can take the top bolt out of the air damper and add some more oil if needed. And I can add an MC70 cartridge instead, but they are a bit £££ :(
But that's about it.
Yeah. It's supposed to be a super-tight press fit. It's possible that previous tried to take it off at some point.
Have a look here for an idea of why.
As long as the upper shaft is still well connected to the top cap, it won't fall to bits :)