That's very incorrect. The reason it's different is that the honeymooners from Fresno lose (or win) based on the house playing blackjack with a known set of parameters. If the honeymooners play perfect blackjack (which is a game of chance, not a game of skill), the expected outcomes can be calculated.

If the whale negotiates the odds in his own games, he's changing the expected outcomes in his games versus the house, but he's not altering the odds for the honeymooners.

He might win physical dollars that were lost by the honeymooners, but because both players are playing the house, it's meaningless 'whose' money he's winning. He's taking money from the Casino's profit margin, really. They're gambling that he'll still lose more than he wins, and the slimmer margins will be made up in volume.

DFS is a skill game both in player selection, AND in skirting the rules, AND in getting the 'house' to tilt odds in your favor -- which directly tilt the odds even further away from the other players.