Yes, that's also what I think. I mean if there is a Demon Hunter vs Demon Hunter match, Demon Hunter always wins :0, so if hypothetically every game in HS was a DH mirror matchup, DH would have 100% winrate.
go back to school my friends
I gonna write this simple for you
in a mirror match demon hunter wins so 1-0
But yeah suprise in a mirror he also lose so thats 1-1
1-1 means 50%winrate