I posed this to my dealer who went to the Zoe product manager. Answer is nothing changed so pre-heat trick still works.. As I couldn't even get the heater on when the engine was not started I would say short of a last minute pre-production change this is a given.When Craig (RZOC) spoke to one of the Renault guys in France he definitely said heating while charging worked.
Also I had brought up the RZOC video as evidence to product manager.. I watched it a few times myself before doing so and I think there's a combination of possibilities that could explain the confusion.
In the video, he asked Guy#1 who then asked Guy#2 if the "AC" could be used while charging.. he confirmed yes AC still works for charging. Which I can see a way in which he would be right, the new Zoe can do AC charging . That or given he then immediately blurted "I'd have to check" he had just adlib'd the previous answer (for fear of otherwise not knowing) and made something up to bat the question away. Either way from other reviews, this test and my own testing it's a pretty certain given it won't work the way you're/we're hoping.. but that pre-condition workaround still working is re-assuring.
I'm more worried about the heated seats regression (doesn't seem to activate if engine is not started). Zoe product manager just stated nothing had changed there.. so if that's the case and the production model still doesn't allow it I will be raising this as a defect.
I'm okay with the heating while charging not being improved.. but not a regression in other functionality we already had.