Are you sure you're still not getting HDCP and HDMI confused? I see nothing on hdmi.org about HDMI 2.3 in any case....
You are correct it is HDCP 2.3, and HDMI 2.1, which is stupid as HDCP is supposed to define the copyright protections and issues surrounding 8K. Then they added the requirement that the HDMI associated with HDCP 2.3 have 300 to 500 ma available on pin 20. They should have changed the HDMI version associated with HDCP 2.3 but they didn't. This just adds to the confusion of this lousy system.
All I do know is that if a unit is pre HDCP 2.3 then the HDMI port will only provide 30 to 50 ma on pin 20. Due to this absurd nonsense a port labelled as HDCP 2.3 it may or may not provide 300 to 500 ma on pin 20. So if you have an AVR or AVP with an HDCP 2.3 video output, then you have to read the specs carefully or contact the manufacturer. I suspect however, that if the 300 to 500 ma current rating is not in the specs it probably does not.
Basically it is totally unacceptable that such a vital spec. is left to chance.
Connecting an active cable to a port that on provides 30 to 50 ma of current is a serious issue and could well be very costly.
I find this situation unacceptable, and it needs to change fast.