I think it would be a bad idea to take the machine apart since it is presumably under warranty, and you may cause problems with that by getting on the spanners. However the first guess I would be making is that you ran it out of oil, it seized up, came free when it cooled down, but by then it had broken the rings and/or scored the bore fairly badly, and it now has very severe blow-by. The first thing to check is whether it has compression, because that is a non-dismantling test for what I have suggested.
Remember, the Inteks/Vanguards have an automatic decompressor, so compression should not be exceptionally high anyway at cranking speed. However normally an Intek can't even turn over on the electric starter if the decompressor is not working, and doesn't spin all that fast when the decompressor is working. Does it spin faster now on the electric starter than it did?
