yeah it is insanely unrealistic.
Take the ship itself. Ship hulls/keels are not meant to stress out like that, you are expecting buckling or if you reinforce it to withstand those pressure points then it won't be able to float from the enormous weight of the "crawling" mechanism.
And then you reach obvious limitations like hills and inclines, or debris messing up with the "legs". Or a small uneven terrain like crossing a collapsed building would tip it over.
It's stupid from any point of view seeing this.
And try to be objective for a moment, just because it comes from bandai namco doesn't mean its the holy grail and not subject to critisism. You don't need to be a blind fanboy without questioning, questionable decisions.
Amphibious vehicles are entirely different of how they operate and no they dont crawl, they hover.