It's a DLC, you're supposed to have made your way through most of the main game. It's too late to complain about the difficulty.
The YouTubers who make videos around Souls games did not complain about the difficulty at all, they know what they're getting into.
And let's not forget ER is the most accessible Souls game, you can avoid enemies, run away from them, come back to a boss later, summon spirit ashes to help you, find and upgrade strong weapons, and use the new system to buff your stats.
If anything the real issue would have been the DLC being too easy for players who are skilled, or overlevelled or on NG+ or all of that. I'm at level 236 and I nearly died to a couple of enemies.
I do have some criticism for the boss design, though.