No one is saying they're "wrong", it's just that, as "creators/dictators of the story" they have the power to add more high elves. They did so with demon hunters. They could do so with high elves.
The playable void elves are not the research team that were forcefully transformed. It's likely that the playable void elves undergo a "safer and more controlled" transformation.Their transformations are not the same. Alleria became a VE by consuming the heart of a fallen dark Naruu. Everyone else was forcefully transformed via ritual.