That's what I also believe.
Imagine putting free smoke upon retreat on, say, Obers or Falls so that you could retreat them and cover a whole tank battalion reversing.
Just imagine.
Those two units you mentioned do have smoke grenades, so yes, you could use them to cover retreats.
Even better because the blendkorpers do damage so you can't push through them, and you don't have to retreat the squad to 'use' the smoke.