You are of course, correct.
And I am not making that claim just because I am Anti High Elf.
Immediately after the announcement of Void Elves the official forums were spammed by threads known as the Unofficial Void Elf discussion threads.
You can find the link here.
https://us.battle.net/forums/en/wow/topic/20761606896
These threads were the genesis of the latest iteration of the playable High Elf movement. At the time these threads were live, the goal was to 'improve' Void Elves by offering them extra customizations. And by extra customizations they meant normal skin tones.
The number of future pro High Elf commentators in the Void Elf discussion threads agitating for normal skin tones and proclaiming that they would be satisfied with it as a 'compromise' (ignoring that getting the thalassian model itself was the compromise) shows that for a large, large chunk of the pro High Elf community, this IS about the skin tone.
Even Ion recognized the large role skin colour plays in this debate by saying, bluntly, that the high elf fantasy of a pale, majestic elf is the Blood Elf fantasy and that it is available on the Horde.
Maybe a few players out there are are genuinely motivated by the desire to have a High Elf in the Alliance because it adheres to fantasy tropes or because it recreates a Warcraft 2 fantasy (both highly flawed positions in themselves) but I feel a lot of people use that as a respectable cloak for the real goal.
The ability to play a pretty white skinned elf without having to hang out with the 'monsters'.
And everyone who commentated in support of normal skins for Void Elves essentially admitted that, as a normal skinned Void Elf is still a Void Elf and NOT a High Elf.