Would Amos run 13:10-20 if he shifted Focus?
Semenya ran the 1500 pretty seriously and 3:59 is much weaker than 1:54. She should have been able to run 3:54 if she was a 800/1500-runner, not a 400/800 person. Could she run 15:10? Probably. sub 15 not so easily, so she would struggle to make a final and be of no relevance in a ~14:30 final.
By the same token, Amos couldn't turn himself into a top 200m runner.
I agree. The main difference seems to me that Semenya's condition should give a larger advantage in sprint or other "explosive" events than in the long distances. (Normal hormone) Women are relatively worst in the 400/800m but they are relatively better in the long distances than in the sprints.