I guess by street food I imply to some extent the breadth of availability of a dish. Have not been to LP, though Suppaniga is serving a lot of Trat cuisine which is severely underrepresented in the LA area.
My point is that everything Isaan Station serves is exceedingly basic and commonplace. Like they serve larb, grilled chicken, papaya salad, and a few soups. That's it. All of those dishes can be found everywhere in BKK or Isaan.
Whereas most of the other places you mentioned serve dishes that, sure, could be found on the street in perhaps their respective regions but would more likely be in more of a sit-down Thai restaurant rather than on a street.
Full disclosure, I haven't been to Pailin and have only been to Ruen Pair once, so I can only judge based on their menus....
Isaan Station's labs are not their standouts and while I think their papaya salads are among the best in the city, I do agree that they are rivaled by Ruen Pair (which I've had once) and Luv2Eat's versions.
Basically go there for the chicken, papaya salads, and soups. Don't expect too much more haha.