LOL! No one can promise you that!
The color space you shoot in and grade in doesn't matter to the YouTube watcher. To view your material in anything better than 709, they'd need a graphics card/monitor/TV which displays "high dynamic range" colors beyond the gamut range in 709 (in fact they most likely have an un-calibrated sRGB monitor, with who-knows-what color temp. and gammas set, like the latest trend of cutting blue out so ppl can sleep better!) . Likewise, if your editing/grading system can only display 709, it's pointless (or worse) to work in a wider gamut space, because you'll never see those extra colors anyway.
If you're delivering SDR content, what shooting in "HDR" (Rec 2020, etc) gives you is the ability to choose which colors to prioritize in your grading/post. If you have a scene with a wide dynamic range (eg. bright sky/clouds with dark ground subjects), your HDR camera will capture more of those colors in 2020 than in 709. But in post you'll still need to decide which parts to prioritize, eg. the bright puffy clouds or the darker ground subjects... likely at least one of those will be blown out/buried once in the more limited 709/sRGB gamut.
For SDR UHD YT content I find h264 and h265 have the same end result, with h265 having smaller file size but being more resource intensive to encode and play back locally. I have the bandwidth, so I usually just do h264.
I'm fairly new to all this also, so I feel your pain. Hopefully I got most of the above generally correct, if not exactly technical...
I don't really understand that chart you posted, I think it's misleading in terms of resolution/FPS... those aren't tied to color space in any way. Nor is bit depth for that matter.
Cheers,
-Max