Their normal earning rate for VP is 1 TC earned per $10 wagered (their system is still largely based on coin-in vs theo, though future comps involve both). CET only has very limited 25-cent denom machines ( Paris and Horseshoe only according to vpfree2; 98.01%, 7/5 BP). If say you had $15K coin-in on designated machines during this 10X promo, you'd earn 1500 TC's x 10 = 15K TC's ( you'd attain Diamond through the end of 2025 and be rendered quite shiny from the trip, FWIW). Then we'd have to define shiny ? If you're unaware of the Diamond and/or the other tier perks...
https://www.caesars.com/myrewards/benefits-overview
I'd suspect you'd get numerous room offers,FWIW. CET is terrible about feeding (resort/ dining credit) players and free play amounts are paltry. The Diamond dinner award is $100 ( two burgers and two beers worth; actually you can do a bit better than that but you have to use it all in 1 stop). No resort fees / free parking at the elusive Diamond tier, FWIW. You'd also earn Rewards credits (for food, drinks, other stuff, etc.)..1 RC earned per $10 wagered ; 100RC's are worth $1 for redemption. If you were to wager that $15K, you'd get about $150 worth of 'comps' above and beyond the tier credit earnings. So you could get 3 burgers, three beers, and maybe a sprinkled donut ( facetiously).
If you play that 98% machine at that coin-in level, the straight math says your EV would be about a $300 loss with perfect strategy; who knows..if you hit a royal you'd be potentially double turbo shiny. Just imagine.
There's several CET 98.45% JOB at the $1 level, FWIW. But as you suggest, the games are generally crappy. Yet, as far as Strip gaming promos this is about as good as it gets on LV Blvd..bar none.