Tocopherol wasn't used as an additive as far as I know, at least any any reputable ejuice vendor, and from I recall the timing on the flavored vape juice ban was oddly around the same time as first COVID cases. It is likely that they jumped to conclusions and then used "some" vendors adding vitamin E as an excuse for such a drastic terrible measure.
Maybe I wasn't clear, but tocopherol was not a flavoring agent. It was likely the cause of the mysterious lung issue affecting vapers, that stopped after it was removed.