afaik rtings use the ear microphone measuring which has its uses to see how much deviations in headphone placement affect the FR curve but overall an inferior and less accurate system than rigs like gras or B&K. if you want accurate measurements then you should look at sources like oratory1990, crinacle, ASR etc that have a proper measuring rig like linus is getting. and its always nice to be able to cross-compare data between different sources though as someone else mentioned most people use gras and linus using B&K affects how directly comparable their data is. and if by cable testing you mean measuring a signal through a cable thats not new at all ASR has been doing it for a while.
also nobody says only one review/test of a CPU is enough so gamersnexus, jayztwocents etc should shut down because LTT exists and the same thing applies here for audio. and LTT as a bigger channel might be able to get access to stuff the other reviewers cant