Well, I don't want to sound like an endocrinologist, but there aren't many chemicals which don't have some sort of effect on thyroid hormones, and if this one screwed up the system in a way measurable by hormone blood tests, it would just cause ordinary hypothyroidism, and that would get treated.

As far as I can see, the evidence for it causing any sort of subtle dysfunction is non-existent. All I've seen is the one study, but it sounds from that as though it would be safe to ingest in small doses.