https://github.com/LibreELEC/LibreELEC.tv/pull/7864 tracks support for RK3588 and RK3568 and I guess when the kenel has some kind of meaningful support for RK3528 the scope will be expanded: right now there's the bare minimum of support upstream and nothing that would be usable with LE. As a general rule, RK releases some new fancy chip that internet reviewers fawn over for having amazing hardware specs, and then you need to wait 2-4 years for the upstream kernel to actually support all the bits that LE needs (audio, HDMI, media codecs, etc.).
If you want something that ships today with excellent software support, get an RPi5. You won't win bragging rights down the pub for hardware specs, but it'll be boringly excellent for watching movies.
Thank you very much, then I will buy a raspberry pi 5