Hades and Dead Cells are certainly not like diablo. the core game loop is to lose and try again, not build up a strong character over the course of a single playthrough as is typically expected of action-rpgs.
It seems like the definition of rogue-like has expanded due to popularity of the genre (as things do) and you have a purist attitude that rejects the new compromises. Rather than create contention over something you cant control, it might be better to highlight permadeath and no persistence as a subtype of rogue-likes for which the original game falls under.
And yes, it probably does need a better general-purpose name but unfortunately the thing it describes is rather abstract so idk what a concise self-evident phrase could be for it