Four links down:
"The staff has determined that the plant design meets the applicable requirements for the design certification stage of licensing. ... The NRC staff’s issuance of this FSER does not constitute a commitment to issue the design certification"[1] The actual review document is not up yet; search for "ML20023A318".
It's not that this is smaller. It's comparable to Shippingport or Vallecitos. The argument is that it's safe enough against meltdowns not to need a full containment vessel, which makes it cheaper. The idea is to have a group of these sharing the same reactor pool. What they do if there's a leak into the cooling pool. Does that take down all the reactors?
Anyway, the plan is to build the first one at the Idaho Reactor Test Station, 830 square miles with reactors spread miles apart. If something bad happens there, it's not a major problem.
[1] https://www.nrc.gov/docs/ML2023/ML20231A804.pdf