It is NOT A FAKE but it is of as little interest as the rest of the exif
information nowadays.
Anyone beginning may need the triangle's reference values but it
is getting the more relative as the mastery kicks in until it ends up
totally useless.
Improvements in terms of DR and low lights recording are some of
the reasons behind the recent appreciation.
ETTR was THE thing 20 years ago and I have been teaching for so
many years that the ETTL approach is better when considering that
one should protect the whites at ALL costs.
I took the main thrust of the video to be saying because different manufacturers assigned different amounts of gain to given iso values it made the values pointless when comparing one make/model to another.
If i was looking to upgrade a camera body one aspect i may look at is how the sensor handles noise at a given iso, now if camera A gives certain results at iso 3200 and i see camera tests and forum posted images from camera B that match it for noise but at 6400 then i may be tempted to buy B.
He was saying if you stop talking iso and use gain from the sensor's base iso the fudging of facts may not be as easy to hide, it only makes sense if you accept the light sensitivity of a sensor never changes, the increase only comes from manipulation of the original exposure.
I do agree with you about the exposure bias and trying to protect whites.