In an honest administration I would figure they would strike the requirement then go forward to answer questions like those to see if there's a need to form regulation around it. And an honest administration could probably bring forth those types of nuances to an informed and level-headed public and be accepted.
We do not have an honest administration, nor an informed or a level-headed public. His firing was likely both retaliatory for making them look bad when the information was released but also "we know this guy's not going to play ball and cause problems for us later. get rid of him"
So what about any of this is news?
Yes, microplastics are a big concern. But Mr. Tyler doesn’t get to make policy all by himself then accuse his employer for being bent when they say Hold Up.