Greybeard former fusion founder here. Wishing you guys all the luck in the world! Email in profile in case you wish to chat.
For all the naysayers, as a fusion startup, targeting the marine market is a good move. They aren't even the first fusion startup to do so; IIRC Rostoker's group got their first major funding from the NRL. The marine market pays a premium for not having to refuel, and historically emerging energy technologies have early commercialization in ships. This was true for fission in the 50s and for photovoltaic solar in the 70s/80s.
Now, sure, they have to make power to be able to sell it. But to build a reactor, you have to raise funds, and in order to raise funds you have to show that you can make money if you are successful at making power. Explicitly aiming at a market that might actually pay for overpriced power shows their investors that there may be a valid business case. That doesn't make fusion happen any easier, but you don't make any reactions without first building a reactor.
You know, I'm sure these guys could work somewhere getting paid to get more people to click on stuff. Instead they are taking a risk to do something that might be important. Make no mistake: fusion founder is a tough gig. There is no established off-ramp, and many fusion founders find that it's a job that can easily eat your career. I hope their plan B is in order, as well as their prenups and/or wills. They are going off to fight a dragon that's eaten a lot of other people's careers, relationships and sanity.
As an aside, it's nice to see someone working on a tokamak actually not being overly optimistic about wall heat flux. It's like somebody actually paid attention to Stacey or something ;)