The google link you provided returns a snopes article about garlic roots, a blog post from McGill saying theres no problems with using human feces as fertilizer, and a bunch of natural/health food sites claiming Chinese garlic is filled with toxic chemicals. Is there any reputable source that says Chinese garlic is bad?
Why do you need a reputable source for that? Why not just taste it? That enough of reason to avoid chinese garlic.
Had no clue this was "a thing". I didn't buy it because "I can't believe we're importing garlic bla bla bla...".