I've got a 2019 Himmy and only issues I've had have been:
steering head bearings corroded (although I did drop it early on in a huge 'puddle' of clayey water while green laning) and needed replacing.
When I first got it, the speedo needle would stick. I traced this, I think, to a loose connection of the wiring block to the back of the instrument panel. It's now wrapped in tape to hold it firmly in place and not happened since. I knwo some suffered with condensation but I've had no problems with mine (once I dried it out from the aforementioned dip)
Original chain isn't the best, mines pretty shot at 7k miles so I expect the one you're looking at will have a replacement. Enfield use some sort of grease conconction on the split link on the standard chain so if yours hasn't got this then it is probably a replacement.
Bars a very feeble, slightest drop off road can bend them, I've done two pairs, and not easy to bend back into shape so sit on the bike, line the wheels up and visually check yours are ok.
I've heard reports of batteries giving up the ghost but mines been okay. Having said that, I do use it regularly and it does see a battery optimizer every now and then (it shares it with other bikes) so hasn't gone more than a week or two not charging.
All the ones I've ridden, including mine, have a sort of weird, sounds a bit big endy 'knock' under load, I've figured it's just how the compression firing sounds echoing out from under the tank and two dealers have told me it's normal so I've ignored it but just in case yours sounds like it has terminal big end failure, they all do that sir ; )
Superb do it all bikes, cracking Winter ride, bung some decent knobblies on it and even capable on the green lanes, hope you like it