AI Detection services are the oiliest of snake oils. Seems like education is going to need to change drastically in the next few years. Maybe we'll go all the way back to oral examinations again.
This teacher should have thought "hmm, well if I'm going to pull up students on this then it's probably important I do my own research to make sure that I know that the score means and how reliable it is" but nope.
"LLMs are bad cause people will use them to generate spam and fake news!" LLMs aren't the bad actor there...it's the human doing the spamming.
There is a fine line, though. For example the "guns don't kill people argument" is pretty moot, gun control saves lives. If someone grabs an LLM, tells it to "generate text telling young impressionable teens to kill themselves" and spam it on Twitter...well the human is doing bad stuff but they're still enabled by the LLM. However it's easy to enact something like gun control on a physical object. Software? Well, damn that's gonna a problem - especially when the metric by which these LLMs "do better" is how closely the text resembles a hooman.