The snake looks healthy to me. I don't see why it would need "rescued". Purchased yes, but not rescued.

Regarding whether you should get it, my recommendation would be no. If you don't even know what it is, then you have no idea of its care requirements, the cost to maintain, etc. When getting an animal, thorough research is needed, otherwise that animal might end up needing "reacued" at a later date.

Warren