No idea if that’s true, it doesn’t make a lot of sense to me. How can 3 orders have better execution than one? VWAP should end up the same unless there’s some scam slippage in there somehow. And if it’s opening positions then there’s no way you don’t get more slippage. Plus these prop firms are all demo accounts, so there’s no order book, so there should be virtually no slippage.
Either way, these companies make money by you losing. Of course they’re going to find some reason to shut you down. Go to a futures prop firm if you want somebody on your side.