They’re still in the process of genetically engineering the bacteria, so their efficiency is still a work in progress.

There’s also the issue that economies of scale tip heavily in plastics direction,

It’s not a carbon neutral process. There’s significant both heating and cooling involved.

And, it doesn’t really solve the issue of retiring plastics.

The last update I read on the bacteria, prior to the genetic engineering, mentioned that the bacteria didn’t actually like the plastic and would only really break it down for want of something more practical. Presumably that has been solved, but I didn’t see it brought up in the article.