Yes to all but the last 2. Reducing meat consumption for a communist society is as simple as allocating less resources to meat production or stopping it altogether. Reducing car use is also simple if you have efficient city designs. For example, the USSR made plenty use of micro-districts (today they would be called "15 minute cities"), which allowed the population to go around using public transport. And the Chinese HSR system allows chinese citizens to travel around the country very efficiently and have vacations and such.

reality is that the disproportionate consumption of the rich far outweighs the consumption of the working people but even putting aside the easy gains of no more private jets and the like, there are things we do and buy that dont even make us happy and are terrible for the planet and often for our bodies like cars. The real question is why people would buy tons of useless garbage they dont want nor need and ultimately dont even use in a society were people arent flooded with propaganda to buy said shit all the time and in a society were ur ability to consume isnt the only measure of a persons worth. And that not even saying anything about repeatability and planned obsolescence.