This isn’t evidence, this is just you stating what you think and ignoring the fact that several pieces of in and out of game lore state she is a void elf.
Like, I could say that pixies are responsible for making clouds, and explain it very well, in detail, but if there’s actually several sources of evidence that come from experts in the field that suggest I’m wrong, I’m wrong.
Doubly so in creative fields. Blizzard create Alleria. If they say in several sources she is a void elf, then she is a void elf. They define her as she is their creation. The end.
The fact she looks different is due to her origins. Death knights were brought up earlier. Arthas, Teron Gorefiend and Nazgrim are all death knights. Yet one is a dead orc raised and imbued with power, one is the spirit of a dead orc shoved into a human corpse and the other is a human whom never technically died, but became an undead like being due to his soul being steadily stolen. Yet they are all death knights. You know why? Because blizzard says they are and they define what is and isn’t the case.
So you can kick and scream that Alleria isn’t a void elf, but so long as blizzard say she is, she is.
I think your mistake is you seem to assume Ren’dorei is a label unique to those with an altered physiology as a result of Telogrus, and thus a “subspecies” label. It is not.
Ren’dorei is a political label much like Sin’dorei, in that Alleria chose the name, and thus it was born, and it was only when Umbric and co joined her, they became Void Elves, before that they were simply Sin’dorei exiles whom had been altered by a void accident.
Presumably the “helf looking” velf, are simply ex-sindorei or quel’dorei whom have agreed to affiliate with Alleria and study and use void magic, and so they call themselves void elves as well, despite the fact they are not physiologically identical to Umbric and his Ilk.
So much like blizzard say “Lor’themar is a Sin’dorei” it’s irrelevant if you think “Nah he’s a high elf tho” so it goes for Alleria.
Thalassian is the species label, the rest like Quel’dorei, Sin’dorei and Ren’dorei are political and cultural labels that don’t necessarily imply any physiological difference, although in the case of Ren’dorei this may apply.
So rather than think of them as races, think of them as factions: you have Thalassians and:
- some identify as Quel’dorei
- some identify as Sin’dorei
- some identify as Ren’dorei