The 300 employees currently on the job market, it's not that grim for them. It's better to have some clarity, rather than live a half life. They can now focus on getting another job. My guess is that most of them won't have problems landing a new, and potentially better paying job. They participated in a project that resulted in the first NRC reactor certification in a very, very long time. Literally nobody else can put this on their resume. There are lots of nuclear startups out there, and they probably have troubles finding qualified people. They'll jump at the opportunity to get some ex-NuScale engineers.
As for NuScale itself, they'll be fine. Their most important asset is their reactor certification. They don't have experience actually delivering even a single operating reactor. But that certification is gold. For many other companies that want to get into the SMR game, it would probably be much easier to license the NuScale design than to go through the decade long process of getting their own design certified.