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@Wingedangel
those forks are fine. to identify a stripped thread, when you look at the threads, they will appear chewed... there is no 'cleanliness' to the pitch, which is hard to explain. Basically as you look at the first picture you took, the ridges (peaks and troughs) are very uniform they go 'up and down' regularly, just like a sine wave, when a thread is stripped...they aren't, they have had the ridges cut in half or flattened, or just plane 'pulled off' (when a thread is really damaged it can completely detach from the rest of thread, almost coming off in a snake like slither of metal, like a slinky) when this sort of damage appears then it can sometimes be repaired, though it is rather awkward, steel threads are possible (require welding and taps, or a helicoil ) ...though if aluminium (as alot of bike stuff is...it's fucked!) though having said that...there is stuff called lumi weld..which is a fix for non life saving stuff..ie...not a rear hub thread.
/\/\/\/\as you can just about see on here the threads are non uniform and have started to come away from the main body of metal,
on the second picture you can see more damage that is typically stripped\/\/\/\/\/
Having a flat on the thread like that makes no odds to the thread as long as the threads are very clean, (as yours appear to be!)