Raw tuna, soy, and avocado do work together in a very Pacific Rim kinda way, and poke on toast isn’t a huge stretch, imo. But yes, it is definitely capitalizing on trends. There are much worse combinations of trends, however. On paper, this isn’t a bad offense, even if it’s very Basic and not terribly exciting.
However, the execution - here, proportions - look off. The problem with most avocado toasts, imo, is how it’s meant to be eaten. Often it doesn’t lead to an easy bite. Things fall off and it requires often both a delicate bite and also a big one to make sure you get the proper mouthful. Here, the poke cubes look like they’d slide off easily. Maybe a fork and knife thing, but it’s not super easy with toast. I recently experienced an avocado toast mess at Outerlands in SF - not a bad dish but it’s hard to eat cleanly, and it ends up being fussy. Cut it up and it becomes more like a salad with the toast becoming croutons.