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.