Forget what you heard, if a man can’t readily see you or images of you he will eventually begin to forget about you. The false theory that making yourself scarce will somehow increase interest is just that a false theory and coming from a lesbian of all people?
More than likely she is probably intentionally giving you false information to produce the opposite effect of reduced interest because the real objective is to destroy the man’s interest in the women she actually wants herself. Believing someone who doesn’t know anything at all about the gender or person she is talking about is completely stupid and idiotic.
And how would a sexual deviant who doesn’t know anything about the gender or person she is referencing know what they have going on? That strategy may work for a while if a man is emotionally attached to a woman but if he has no emotional investment it will only reduce the fragile interest he already has. And she will eventually be out of sight and out of mind.