I never claimed it would replace it?
I said Blizzard had no interest in making a Dark Ranger class. This is supported by the fact that we had a Shadowlands expansion, and no Dark Ranger class, all while they have an Evoker class planned for 10.0 which shows that they aren't secretly planning some Dark Ranger Class within the near future. I didn't say they will never have an interest in making a Dark Ranger Class in the future.
Concerning Darkfallen Hunter, all I can say is if they plan on making Dark Ranger customization options, it would greatly diminish the future chances of a standalone Dark Ranger class.
Do I consider a Beastmastery Hunter, Fire spec Mage and Fury Warrior a replacement for Beastmaster, Blood Mage and Mountain King standalone class? No, I do not. But the chances of Blizzard making them into standalone classes would be quite low considering the amount of representation that already exists. If Blizzard intends to complete their identities, then customizations are the most sensible option.
I said Blizzard showed no intention of a Dark Ranger class with what we know of the story so far. I never said Blizzard will never add new Dark Ranger story to allow a new class in the future. Just like I don't discount Blizzard making any class in the future; literally anything is possible. Even if I think a Fire and Arcane spellcaster would be unlikely since we already have a Mage, I would still leave room open to consider the possibility, which is exactly I never dismissed any of the rumors of the Evoker and remained open to its speculation. I don't discount possibilities.