The £50 package has all the DLC
You can’t buy Nioh 2 on PS5 without it being the “complete edition”.
But if you own only the base game on PS4, you can download the “PS5 upgrade edition”, which is just the base game, and any DLC you own on PS4 gets you the PS5 equivalent for free.
It sounds more confusing written out like that than it actually is.
The game is still for sale
The DLC is still for sale.
The complete edition is for sale.
Anything you buy gets you the PS4 and PS5 versions.
Note this only applies to Nioh2. The original Nioh does not get a free upgrade, and therefore the only way to get the PS5 version is as the complete edition
(Which incidentally I bought and am strawberry floating loving. I’ve been chipping away an hour or so at a time every evening on my twitch:
https://twitch.tv/pyxl8)