There are big pincer with big tail scorpions that are mildly venomous. I’m not sure about the other direction because the only ones I’m willing to handle are emperor scorpions. That may be because I found a striped bark scorpion in my shoe the hard way when I was a kid, though. That wasn’t a good day.
It is a cool guide, but this one should really come with a list of exceptions. Assuming there are big pincered highly venomous scorpions.
For anyone curious, yes, there are exceptions for human contact, but mostly due to human physiology. More venomous does not mean more potent.
The rule could be considered true in that larger pincers hold longer allowing weaker venom to take action in prey.
But for humans, we react differently to different venom, so some scorpions with larger pincers can be more dangerous.
There are big pincer with big tail scorpions that are mildly venomous. I’m not sure about the other direction because the only ones I’m willing to handle are emperor scorpions. That may be because I found a striped bark scorpion in my shoe the hard way when I was a kid, though. That wasn’t a good day.