It was already known that some kinds of plastic release microplastic particles when heated. I assume this is why we have some plasticware that is labeled as being suitable for microwave oven usage, but at quick glance at the abstract doesn't seem they considered this difference. It would be interesting to know the amount of micropastic released by "microwave suitable" plastic vs common plastic.
Almost as bad as "flushable wipes" which technically can be flushed but should never be as they clog the plumbing and sewer systems. By the same definition airpods and wedding rings are flushable too.