The point is that Steve and crew kept lying. When it got to the point of posting that there is no transaction on the blockchain, Steve then went to the payments were being paid by Sportsbet in installments in USDT.
Seems like you're doing a lot of nitpicking about nothing. They don't owe you any information that could potentially be used to deanonymize the winner.
Don't know why you are backtracking from this, which was a much more reasonable stance:
The player won through Sportsbet and it’s a great gesture on Sportsbet’s part to celebrate with the player.
Sure, they may not have technically been the ones paying out the amount to the winner, but the winner had an account on Sportsbet, and its not wrong of them to want to use the event for promotional purposes. You can argue that they should have worded it better, and we all learned something about how the Wowpot works. Continuing on complaining about how the payout was conducted is a waste of time and kind of creepy. They don't owe you any further explanation.