But it does not mention ‘an attached garage’ or ‘not attached’.
It says (paraphrasing slightly),
‘PME earthing facility shall not be used as the means of earthing for the protective conductor contact of a car charging point located outdoors or that might be reasonably expected to be used to charge a vehicle located outdoors, unless one of the following methods is used;’ (722.411.4.1)
A subtle difference, do you not agree?
I‘ve not seen an isolating transformer for a car charger just yet.
I looked into the isolation transformer option some time ago, but the cost was ridiculous, a 230/230v 8kVA is around £853, it weighs around 75kg, and this is without an enclosure (or delivery)
This is from a standard manufacturer, I would expect you will be able to get a Chinese version on-line for around 1/2 of this, but with import duty etc, not sure how big a saving you could make.
the isolation transformer idea, sort of ok as an idea, but I think impractical in the real world for normal charge points.