Best educate yourself of your ideological 'limitations' first. There are a couple of reasons why you are failing to grasp her post.
Firstly, you don't seem to understand the guiding principle of feminism which is self determination that isn't limited by reproductive biological characteristics. Principles retain their legitimacy only when they are consistently held. One simply can't demand self determination for one's self (women) & deny it to others (trans people). Reducing trans people's identity to deluded 'performers' of the opposite sex is an attack on their self determination which ironically mirrors MRA's who reduce feminism to simply 'man envy' rather than recognise their inherent psychological interchangeability with men. See the parallels between trans & women's struggles?
The second reason you are struggling to understand her post is gender critical ideology is underpinned by blank slatism. That is, they don't believe feminine & masculine expressions are organic inclinations rather imposed culturally as Germaine Greer explains below all while she is ironically 'performing' stereotypical femininity with her feminine presentation.
What gender critical's & GG seem to miss is humans don't blindly replicate one another. We don't do monkey see monkey do. There's usually what's called a 'missing link' where 'copying' is preceded by an organic inclination to a preference. Our inclinations often have deep roots in genetic & hormonal influences that form our personality traits. Again, feminism wasn't about 'copying' men because there was nothing to copy. We women already had within us the same psychological traits that legitimised equal treatment.
Another example of transphobia being rooted in misogyny is how much more trans women are demonised & dehumanised than trans men particularly as being motivated by sexual deviancy & predation.
The common refrain we hear from GC talking points is 'trans people promote stereotypes by claiming the are the opposite gender' but even if they didn't claim they were the opposite gender we all know that despite what a natal male who expresses feminine presentation calls themselves it would still be socially unacceptable but not so for a butch natal female. Clearly there's misogynist social expectations regarding gender expression that is unrelated to what trans people call themselves & yet trans people are accused of being the enablers of it.
Now some might say that trans people promote sexist stereotypes by expressing traditional /feminine behaviours but don't cis women too? Aren't they 'promoting' misogyny too? Or are they 'let off the hook' for 'not knowing any better' as hapless 'victims' lacking autonomy? Or might it be both these groups like what they like because of internal inclinations that just so happen to be aligned with social expectations but still have every right to self determination just like everyone else.