Unfortunately it looks like this isn't just confined to some touristy areas on Sukhimvit or Khao San road.
They are targeting the Thong Lor, Ekkamai and Phra Khanong districts too, specifically Soi Thong Lor, Soi Ekkamai, and Soi Pridi Banomyong: https://coconuts.co/bangkok/food-drink/first-soi-38-closed-s...
Completely ridiculous of course since street food is super delicious, affordable and remains one of Bangkok's biggest attractions. Hopefully this move doesn't spread to all of Bangkok, but who knows.