Why when I want to buy this game, steam says that Nascar Heat 5 is no longer on steam?

UPDATE (6.29.23): A fix has been deployed for those who were unable to access the Next Gen Car Update content after purchase. You will now be able to experience the Next Gen cars in NASCAR Heat 5. Thank you for your patience! _____________________ (6.22.23) We are currently aware of an issue with the Next Gen Car Update release and working towards getting you in the game as soon as possible. We will provide an update as soon as we have a fix. Thank you for your support and feedback! - Rusty / Community ...

are their any fixes

The "2020 Season Pass" says "...You will also receive the Tony Stewart content that includes Tony as an option for the in-game spotter, an exclusive Career contract offer from Stewart-Haas Racing, and classic Tony Stewart paint schemes!" But can we get the same items as the above when purchasing the "Ultimate DLC"?...

We bought this game under the primes that unlimited use is what we purchased. If STEAM has chosen to not support this game then every single one purchasing it should receive a refund. PLEASE join me folks in demanding that STEAM fulfills its obligation to supply access to a game that we all purchase or immediately refund us all!!!!!! This has gone on too long with no repercussion on our part?...