I contact Orei Electronics they expect to have their SPDIF Audio Extractors HDMI 2.1 in February.
They are struggling with electronics supplies due COVID, also HDMI forum certification has to green up its product.
These are well built, metal housing tested and great quality (around $35) better than Astro's.
Its current product on the market is HDMI 2.0b and offers:
Supported Resolution:
Video Pass-through Up to 4K @ 50/60Hz (YUV4:4:4),
4K @ 30Hz, 1080P @ 120Hz and 1080P 3D @ 60Hz.
Color Depth: 10-bit, 12-bit
Supported Audio: LPCM 2/5.1/7.1CH, Dolby Digital, DTS 5.1,
Dolby Digital+, Dolby TrueHD, DTS-HD Master Audio, Dolby Atmos, DTS:X
This device supports full 12bit color depth and 1080p 120Hz, where astros is only 10 bit, and lacks of 1080p 120Hz.
Honestly is enough for most next-gen games. Very few esports will do 4K at 120Hz, triple AAA single players 4K are 60Hz at best. But if you want 4K/120Hz, wait for next year.
If you have a recent 4K TV most likely it have SPDIF / Out so you don't really need it. However, several monitors and TV's with built-in HDMI audio extractors tends to have ground loop issues (buzzing sound) which are unfortunately very hard to get rid off.