Very skeptical. Ever since the ball lightning-is-fusion craze of the 90s, lots of people were claiming to have done small scale p-B11 fusion. Being able to produce a few helium nuclei isn't the same thing as achieving a Q>2 or Q>10. I mean, NIF "achieved" fusion, but we all know it's not able to extract net power.

I still believe Commonwealth Fusion Systems with their SPARC/ARC small tokamak design will be the first to achieve a viable commercial reactor.