GMAT Sentence Correction (SC) | Re: Though now eaten in large quantities around the world and

Hi,

I have a short question about the parallelism of adjectives and participles. Don't they both fall into the same parallelism category? I'm asking, because in the explanation of a MGMAT QB-question they said that the following portionsX andY aren't parallel:

Though noweaten in large quantities around the world and harmless , the tomato is a member of the generally toxic nightshade family.

Is it correct, that the two portions aren't parallel or is it an error in the explanation?

Thank