Yeah nah. I didn't play Nioh since launch and never played the DLC, so I had to look it up, and you're just straight up wrong, sorry.
Sekiro:
Human peasant enemies with:
Sword
Spear
Axe
Torch
Bow
Shield
The alarm banging guys
Strawhatted Sword (completely distinct from the peasant Sword variant in moveset)
Guns
Advanced enemies:
Ashina Elite
Dualbladed Staff Guy (The acrobatic ones at Mount Kongo)
Giant with Hammer
Giant with Bell (again, completely different moveset)
Crow Ninjas on rooftops
Cannon wielding guy
High range sniper
Small Centipede
Rat Assasin with a mobile moveset and a grab
Rat Assasin with wooden/metal hats, more stationary. (granted, the Rat assasins share some moves like the poison)
Dungeon Patient (Zombie-likes)
Fountainhead Noble with flute
Fountainhead Noble without flute
Funtainhead Archer
Fountainhead Swordsman
Fountainhead ball playing guy
Fountainhead elite with lightning
Dualwielding Tengu from the ministry
Flamethrower guy from the ministry
Purple Ninja from the ministry
Monk barehanded
Monk with staff
Ranged Monk with homing bombs
Sitting Monk with Gentipede
Sitting Monk spawning bugs
In wildlife we have:
Dog
Lightning wielding Dog in Fountainhead
Rooster
Carp
Lizard
Monkey
Monkey with Sword
Dual Wielding Monkey
And I didn't even get into bosses/minibosses.
Again,
these all have wildly distinct movesets. Most of them (outside the wildlife stuff) have between 4 or 5 distinct moves. Some even more. If you just see peasants/monks/samurai and think bad enemy variety, that's on you.
Nioh:
https://nioh.wiki.fextralife.com/Enemies