Yeah you can. Simply because you can believe that when someone has the anatomy of a (wo)man and feels internally aligned with that, they are representing their gender identity, not their sex.
So someone like me who has a vagina and so was classed as female, and has no feelings of dysphoria or desire to identify as anything but a woman, is indeed a woman but because of that internal alignment. Not because I was born with a vagina.
So by that standard, my sex (ie being XX chromosomed and having the body to match) is irrelevant to my identity as a woman. It is the alignment of my internal and external self that makes me a woman. A misalignment would mean I am other gendered or perhaps non-gendered.
Someone can still want people who both have my anatomy and who is comfortable identifying as a woman, and subscribe to gender ideology. So they can feel that trans women exist and are valid and women and whatever else, but still only harbour attraction for women identifying people with natal vaginas and breasts.
For example, most "pro trans" people would be perfectly understanding of a lesbian who isn't interested in dating a trans man despite them having a vagina. They'd understand that despite the person's anatomy and chromosome configuration (XX), someone who doesn't identify with womanhood isn't attractive to someone who is attracted to women.
BTW, I'm not saying everyone who is "pro trans" feels this way, I'm just saying it is possible for these beliefs to exist simultaneously and so it can't be intrinsically homophobic to subscribe to gender ideology. You have to subscribe to GI and genuinely believe that someone who isnt interested in dating trans people is inherently transphobic. Those people do exist of course.