I doubt it is the bitcoin we know today, if it runs on the same blockchain. While I think it is a distinct and perhaps highly regulated entity, it is not a blockchain but a centralized management system. Now, I doubt that there is a currency that is more centralized than fiat, so what the OP is talking about is not a threat at all because we have long been used to it.
if you know how to check the transactions involved, you will understand if those bitcoins are fake or not. check the address in the blockchain, and see if it is indeed in the said address. only those who don't dig enough will be victims of this scam. though i haven't encountered about these so-called flash bitcoins. but it is not a threat as it won't affect the price in the market.