So the answer is in theory yes, in practice it is mild nonsense.
Actually, even in theory the answer is really no - even if you invade the USA with just one division. You will probably find that it will run out of supply (but more likely be eliminated first).
Practically speaking I would not be so kind as to call it "mild nonsense" but just "nonsense" to better express the amount of supplies consumed by a "fighting army".
If you landed in New York with its 16 factories (as per my Nov 1940 game) and took Newark very soon (with its 15 factories) and had one division to hold your beach head, maybe I will be proved wrong.
As regards any real size fighting army (include aircraft) to take USA as per any invasion of USA I have ever done, I think I was running 300 convoys daily to keep it maintained and increase the stockpile there. The possible 15% of IC minus revolt risk is after the provinces are repaired. If I understand correctly, it is zero IC and only revolt risk upon landing. As unit will have consumed some supplies in amphib, seems only theoretical supply you got left is what remains on unit (10-15 days if in combat?) and the smidgen that was dropped in province upon landing.
Why Mr_BOnarpte? You don't want to run convoys?
However, if you really want to you can actually get around the normal convoys. Using just one unit and one transport you could indefinitely suppy any size army for eternity by simply having that unit jump on the province 10-100 times or more daily (depending on your needs). Every unload from transport will drop more supplies in that province, those supplies taken directly from your "at home stockpile".
As British player I do supply Hong Kong (with one GAR) this way for years without ever running a supply convoy. And if using alliance troop, the supply is taken from their capital stockpile. It can get pretty boring (I do it once a month with about 25 jumps), and for an army the size needed to conquor USA it would be mostly playing "load-unload, load-unload, repeat umpteen times".
So Pang is right - in theory "yes" by resorting to an exploit.