Greg. That comment was a bit tongue in cheek
I don't mean any sort of movie mode, just manual bulb mode for full control.And always in RAW, that a given for best results.
You can take time lapse with any camera, is just harder with some, and with serious post processing anything is possible.
Ye, the lens twist locks aperture down to stop flickering. Nikons can't do this although it appears some sort of lens adaptor may make it possible. The little bumper is one of very few ways of doing TL with ap/Iso control, and it's spec says it won't work with Nikon because of the way it handles bulb mode. I think that means flash feedback can't be used to stop flickering at short exposures, or it can't be exposure ramped reliably in small time steps.
All these limitations just mean more post processing to eliminate flicker. As you say, Alex has produced award winning TL so it's obviously possible, just harder.
There's good reasons for most timelapsers to use Canon, particularly the 5Dmk2.