Few things to add about MacOS power tables.
IF those power tables are for Apple GPUs, those are the specs within which the Apple GPUs have to operate. The TDP is for WHOLE GPU BOARDS, that are connected to Macs, or rather, Radeon Pro versions.
Otherwise, its just what DisEnchantment explained. Another power table that came from AMD.
If we will find BIOSes for those GPUs in MacOS, then we are at home. From those BIOSes we can get everything related to clock gating, voltages, power gates, etc.
For example, Radeon Pro D700 have had 129W TDP, for whole board, with 1.025v, clocked at 850 MHz. It was possible to exctract the exact details from MacOS back in the day. I don't know if its still possible.
Ok, I now need to correct this.
The data about Radeon Pro D700 is pulled from the GPU BIOS. Its the same situation as is for Radeon Pro 5700 and 5700 XT in Apple MacOS.
The data pulled from the OS is the typical spec, for specific die that system has to work with.
This is the reason why, you can put for example Radeon RX 5600 XT into MacPro and it will work out of the box, but with the typical Radeon RX 5600 XT clock speeds(for example1650 MHz game clock and 1715 MHz Boost clock).
You can't extract GPU BIOS without having the GPUs on your hands. The data, for Radeon Pro D700 and for Radeon Pro 5700 and 5700 XT that is on the TechPowerUp database is straight from the GPUs. Also Radeon Pro 5700 and 5700 XT 130W TDP is for WHOLE BOARD. GPU+Memory subsystem.
So those power targets that we have seen leaked may not be final, and Apple versions will still be more efficient, and clocked lower, however,
IMO, the details about Navi 21A and 21B are so highly specific that I believe this might actually be something very close to what will be possible to be pulled from the GPU BIOSes. At least, those might be close to final Navi21 based Apple SKUs, with those, exact specs.