your conclusions make sense, they've had a few $3.75 and $7.50 ones.these are pretty easy and approve immediately but I think they've doubled the amount of work involved (two conversations instead of one) for the same pay.
Used to be 1 long convo exchange with AI to review for $3.75, instant approval. I notice this one linked above, was 2 long convo exchanges, for $7.50.
They also had a few other types of $7.50 HITs for a while, that were reviewed before approval. I used to just take the $3.75 ones because they instantly approved, and higher paying ones before, took review time.
This one took about an hour (one convo was veeeerrrry problematic and took longer to annotate) and instantly approved, 2 convos to review, total.