Pointing out an inconsistency isn't always whataboutism (and I don't think it was in this case). An implied argument was made that we should regulate LLMs for the same reason that we regulate drugs (presumably addiction, original commenter wasn't entirely clear). It is entirely reasonable to wonder how that might extrapolate to other addictive activities. In fact we currently regulate those quite differently than drugs, including the part where alcohol isn't considered to be a drug for some strange reason.

The point being made then is that clearly there's far more to the picture than just "it's addictive" or "it results in various social ills".

Contrast that with your human trafficking example (definitely qualifies as whataboutism). We have clear reasons to want to outlaw human trafficking. Sometimes we fail to successfully enforce the existing regulations. That (obviously) isn't an argument that we should repeal them.