Unless they start selling the female version of all Pokemon in the game, I doubt the money-grubbing chinks who made this game even know or give a shit about the gender difference.
And Eevee doesn't have its updated VO that came along with its gender difference in LGPE/SWSH, so just call it whatever the fuck you want. But we all know Sylveon is actually a straight, white, cis male Pokemon, the Mainline games provide all the evidence supporting that