A Redirect Missile effect should redirect it on the point or unit you specify. It is usually not limited to specific planes. I am not sure, if I understand the problem correctly. When I redirected a missile targeted on a specific unit to another unit, it just changed direction and followed that unit, as expected.
Eiviyn stated, that this particular video was almost 100% data, the projectiles are units moved via force effects. Collision is probably done via periodic search effects on these units, bounces apply force effects etc.
thas what I was thinkin, though I then tried applying forces to missiles and for some reason couldn't move em, so now I suspect that they are in fact dummy units pretending to be missiles with dummy movers. "units moved via force effects" as you say, or at least using a different throw type than the missiles I was testing with.
I made a trigger that redirects missiles you have in play to the location of your mouse, when you move said mouse for testing purposes, the missiles would move along the Y plane, but they would not turn toward the mouse on the X plane, I used a couple different missiles/movers for testing with the same result
So then I figured that the units are moving via behavior that periodically applies a force effect on them toward their current facing, then you can just use basic unit collision to make them not face each other, soooo been working on testing that out
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Zergling Blood : starcraft://map/1/35684
Game of Thrones : starcraft://map/1/189756
Tacticraft : starcraft://map/1/223625