I think it is a MM
The fact that they are using 10k Whacks, that is the min amount that MM can offer to buy or sell, makes me think it is a MM for sure.
Any person that wanted to whack the BIDS could do it for as little as 100 shares and get the same result, but the commission of what $9 bucks at best is still a waste of money.
MM don't have any commission cost so they can trade as many times as they want, all in the noble cause of making a market, what a joke.