Bedrockgames
I post in the voice of Christopher Walken
No it really isn’t just “all taste”. Good grief that first paragraph reads exactly like “one drop”. That it’s a fictional race really misses the point.
I don't think that is what they are trying to do. But if they were I still wouldn't think it is endorsing that. It more likely be like the Van Richten thing, where they are playing with a real world concept to show how elves are racist against other races or something. That or it is just about how elves are a magical race of beings and if you mix human in they aren't the same. Either way, the point is you can have elven blood and still be human. It doesn't take away from someone's humanity. Now if someone were to take that concept to write up some sort of Aryan fantasy world, sure that would definitely be a problem. But I don't see an issue with the base elements in the text.
And again, this is just the entry that I like. The broader issue is whether Half Elves as a concept are tenable. You can easily have an edition that doesn't include the stuff that was in 2E and it would work fine (that stuff you are pointing to is all elaborations but I wouldn't say it is essential to the idea of half elves in the game)