Interesting yes, but regardless of the scientific viability of Helion's approach (that I have no means to discuss), at least they are aiming at addressing the core problem of fusion energy as an investment strategy: turning an non-existent into an existent technology. What bewilders me here are people discussing the business model and implementation details of these ships' reactors for the endeavor to become profitable. These kind of discussions would only be appropriate in the Worldbuilding StackExchange.
I guess taking an optimistic view, these sort of designs seem quite similar to the MIT ARC/SPARC design put forward in a lecture put up on youtube "Breakthrough in Nuclear Fusion? - Prof. Dennis Whyte" https://youtu.be/KkpqA8yG9T4?list=PL_ywmYr5cjkBWSPyqEaps8uGu...
That actually seems a reasonable attempt at a practical design so all Maritime Fusion have to do is wait till someone cracks that and then do the marine version.
