Your 1 - 3 do not indicate HDR. 4:2:0 and limited range are standard for everything back to DVDs. Video with BT.2020 color primaries is usually HDR, but not always.
4 being non-constant and the presence of 5 - 7 all indicate it is encoded as HDR video. 5 - 7 is the "HDR metadata" you may have seen discussed.
Edit: I got confused on this point again.
BT.2020 non-constant would also be used for SDR BT.2020, it is BT.2020 constant that would most likely be HDR. I believe most HDR material out today is BT.2020 non-constant anyway. The constant or non-constant refers to linear or gamma like transfer functions, constant is linear.