Dark Souls is mechanically easy (just learn patterns and dodge) but it has high number difficulty because you can die in 1 hit and it takes more than 1 hit to kill enemies
I see it as the opposite.
Dark Souls is mechanically difficult because you need to get good at the mechanics to succeed in the game, gaining levels really won't help.
In short:
- mechanics - player needs to get better
- numbers - player needs to grind