@RalphTheLiar what I think is that the reason for skipping 2 years is because that time gap might have caused the show to take longer just to fill in that 2 year skip, maybe they could've just made 1 flashback episode specifically for that time skip but who knows, what is done is done.
NHS is a really interesting concept since once I take notice of that kind of concept in other stories, I would know that it's an isekai country plot, for me as well, what makes it more exciting is if that country is superbly technologically advanced, like it has access to interstellar travel and etc. Although Japan is already technologically advanced in terms of eras since TDP's era is medieva-magi. (magi is intended) I really love isekai country stories especially when that Protagonist Country is technologically advanced than everyone.