Stefan was talking about the nylon in his mini voron build video - I posted a thread on it this week.

Pretty sure he wasn't printing it in an enclosed printer either.

yeah the ender 5 is probably the best machine creality currently make.
There is very little you can do to bollox up a standard cartesian printer.
Apart from giving it a bowden setup - which they did. But that's an easy fix and you can usually use the existing extrder - like I did with my sapphire pro.

I'd switch it to a direct drive extruder before actually running it - but I just do not see the point in a bowden extruder on a cartesian setup.
Particularly when you look at some of the lightweight all-in one hotend extruders there are around at the moment.
No excuse for it.