Yep, that was my understanding as well
It's a about the email exchange between by the author of the fuel tax and the guy who introduced the law (if I recall correctly) in which they admit the tax is only a way to recover the tax revenue lost after the government decided to keep lowering employer taxes (aka C.I.C.E). The fuel tax was required after the Paris Summit (which took place before Macron became president) and the current government took it as an opportunity to switch the tax burden from the biggest companies (the ones that benefits from the CICE) to people who can't afford clean vehicles.
I'm a yellow vest only because I care about the environment.
I was in most of the demonstration and believe me, we share a lot between ecologists and the poor workers who cannot bear the burden of the transition. I come from a "milieu social" (don't know how to translate) where you pollute 100 times more than the poor and be praised by Macron for being part of the "startup nation", "those who succeeds vs those who are nothing" etc.
Macron doesn't really care about the environment (ask Nicolas Hulot!).