Then you’re misremembering a lot of stuff

https://www.rtings.com/tv/reviews/sony/x900h

This tv came out around the same time as the ps5 (Nov of 2020). A few features came in a later update, but it is 4k/120 out of the box. You couldn’t get a better tv at the time.

The 800 was never advertised as 120, this is the first model.