I think "female-coded energy" is a weird turn of phrase and unfortunate as it serves to bolster the notion of a fantastical "female essence".
"Stereotypically feminine behaviour" works better as an objective observation of another person, expressing that observation with reference to societal norms and expectations.
Once upon a time, "effeminate" would have been the go-to word but it seems to have negative connotations these days and has fallen out of use. Now it would come over as just a posh way of slurring a man or boy as a "sissy" or "a big girl's blouse" or as a way of hinting at (shameful?) homosexuality.
The "energy" part of "female-coded energy" seems to express JKR's subjective experience of her interactions and relationship with her male friend. That "energy" cannot be measured as something radiated by him: it exists entirely within JKR's perceptions, her psyche and self-awareness and is a product of the relationship.
I might have missed something in the thread but I don't think the word "groomed" has appeared yet? This does not have to be a deliberate, deceitful, manipulative process.
JKR seems to have found a mental compromise that works for her without creating cognitive dissonance.
While some people will take from her words that perhaps some men have "magical female essence", others will use them as a stick to beat women into submitting to demands that they be "re-educated" and rearrange their thinking - just stop being bigots and #bekind like JKR.
However, as so many PP have already pointed out: JKR's position is not new. Anyone who is "disappointed" has not been paying attention.
The way the OP has expressed their disappointment says a lot more about them than about JKR:
JKR: "I find it perfectly easy to reconcile my fond feelings towards her, and my experience of her as someone with very female-coded energy"
OP: This does make it seem like when she calls TIMs out she is now doing it maliciously as she is perfectly happy to play pretend if she likes them enough.
This reaction has the same "narcissistic energy" (!) as that of a TiM who would have been be infuriated to have been "called out" by JKR and now has had his nose rubbed in it by her clear indication that she finds him deficient in "female-coded energy".
(Terrible, terrible, wicked JKR - so full of malice! As for those awful bootlickers she hangs out with, who get all the precious, precious pronouns. [Shudders!])
I am not saying the OP is a TRA, just that it strikes me, as it has struck some PP, that they are giving off "TRA-coded energy", IYKWIM.
OP you have prompted some really thoughtful and interesting discussion but FFS OP, cool your jets!