These threads always get quagmired in vitriol slung towards the transgender athlete in question. You folks are nuts if you think someone willingly transforms their body and exposes themselves to ridicule from folks like you because they are "narcissistic" or that somehow this is about doing better in sport for them. Try a little empathy for once.
The real question that should be discussed is - does hormone therapy negate the advantage enjoyed by men over women? Does this differ between event distances?
Prior to transitioning, June had a personal best of 24:16 for 8km. Using the Mercier calculator, which is generally pretty reasonable for comparing across sexes, this is equivalent to around 20:55 for a women's 6km. 20:55 --> 20:18 is a fairly reasonable progression for a college athlete over two years.
Two years ago, prior to transitioning, Eastwood came 41st at this same meet, around a minute off the win over 8km. The runner directly in front of Eastwood in 2017, Zack Litoff, competed as an unattached junior (I'm assuming redshirt) in the open race this year and finishing 4th in a time that would have placed him 3rd overall in the invitational.
So, there are few possible theories:
1. Eastwood's improvement is due entirely to her male sex characteristics (possible)
2. Eastwood's improvement is in keeping with a progression one could expect over two years of training in college (also possible - Zack Litoff had almost the exact same progression)
3. Some combination of the two
There is obviously a lack of robust evidence telling us exactly how much a year of hormonal therapy equalizes the playing field. There are a number of case examples and more will come up as time goes on. You can't exactly do an RCT with this, so I imagine the answer involves looking at the pooled progression post-transition of transgender athletes competing in the NCAA and comparing it to the mean progression of athletes who didn't transition. If there are massive disparities, then I would agree different rules should be in place.
In the meantime, lets stop vilifying a college kid who already has enough negativity on her plate.