I'm not questioning if it's true, but have you tested it?
I'd pay good money to know how that solenoid works. For example, people say that if you disconnect the solenoid the sled will eventually pop out of forward. This implies that the solenoid is applying pressure to the fork keeping it in forward. If this were true you'd think that it would shift into forward all the way, but people have had it pop out of forward due to it not being shifted all the way into forward.
I myself no longer can shift into reverse. It either grinds or it goes 10 feet and pops out. This started after I cleaned the sensor.
My theory is that the solenoid has a fixed range that it will move, and that range isn't wide enough to shift all the way into forward and all the way into reverse at the same time.
If this is true, which is a huge if, you could have the following conditions:
1) Sled doesn't shift completely into forward or reverse, but far enough into each that it doesn't pop out of either. In this case the reverse works fine as long as the gears mesh up. This is the condition that you want it to be in I guess.
2) Sled is shifted all the way into forward. In this case it doesn't shift far enough into reverse to keep it from popping out. I believe this is the case for my sled, since when I put it together I put it all the way into forward on assembly.
3) Sled isn't shifted into forward enough to avoid popping out under load, but shifts fully into reverse. I think there are an unlucky few who have this problem since when it pops out of forward it destroys the small splines and will no longer shift into forward.