You can't know that. The regulations and testing requirements were suspended, so companies were free to use benzene and nobody would know.
We already know for sure that some companies did use benzene, and its not hard to imagine companies switching to a cheaper, lower grade source for their alcohol.
In any case, the government simultaneously saying "Its okay to put benzene in hand sanitizer" and "Everyone should constantly disinfect with hand sanitizer" was not a good move.