For example, en.wikipedia.org/wiki/GeForce_40_series uses TDP. In particular, RTX 4070 in its thermal base configuration is advertised as 200W TDP and this agrees to the ~200W TDP mine shows at full load.
Thermal design power (TDP) is described, e.g., at en.wikipedia.org/wiki/Thermal_design_power as "the maximum amount of heat that a computer component (like a CPU, GPU or system on a chip) can generate and that its cooling system is designed to dissipate during normal operation." Therefore, a graphics card being a computer component can be measured, in particular, by TDP.
During the introduction of RTX 3000 and 4000, TDP values could be trusted while TGP or other thermal values misled.
Educate yourself.