It's a good sign but you have to look at the yield of the process.
Also, these things work only on the surface of the materials, not deep within the body of the material.
That means you have to grind the plastic waste into small particles, then put it into a vat or broth of the stuff, in order to let the micro-organisms (or enzyme, as the case might be) do their thing.
Then you have to see if a micro-organism can survive and reproduce in the broth, even when it is mixed with the waste products.
So you have to know what the by-products are, and whether it is easy/possible to get rid of that. You have to know how long it takes for the enzymes or micro-organisms to break down the plastic.
Enzymes are easier to deal with than micro-organisms. There is less concern that they will be poisoned by the waste products, but the yield issue is still likely to be a big issue
So it is a step on the way, but definitely not the complete answer yet.
PS - greetings from Chengdu, China. Just debating whether to pay a guide to take me out to see some pandas on Thursday, or stay in the hotel and do some work...