Jay,
No, it is not 'exactly' the procedure that we have used. We use
'hot' not 'super hot' water from the tap. The water only needs to be
warm enough to melt the ice and snow. The bag of 'hot' water typically
rests on the ice/snow layer(not directly on the paint surface) until
it softens and can be pushed off with a squeeze blade. Sudden and
extreme change in temperatures is not good for any material. Very thin
or improperly cured paint would be more sucesptible to crazing
especially if the hot water is sprayed or splashed directly.

Hai Longworth