Yep. I suspect many of the permethrin products are fine if used correctly (e.g. don't put them on your poor snake). I'm paranoid though, so I tend to stick with recommending Provent-a-Mite as the only permethrin product I am aware of that's been approved in the U.S. for use on reptiles. I'm just so glad that Nix the snake seems to be OK. They said he's stopped biting and has returned to his normal sweet temperament as well, so it really does sound like he is feeling much better.
And it even seems like he's maybe decided to forgive them for almost burying him, lol. They actually had the hole dug and were getting ready to put him in it when the husband thought he saw a slight movement =P Talk about a close call.