Trump has never specified how their return would be expedited and he has not said that for a long, long time. He has always said thy must be deported, the only candidate who has been consistent in that regard. Bush, Rubio, and Kasich have said they can stay and Cruz has shifted from legalization to deportation without rounding people up.
“Thought out” doesn’t mean makes sense. Of course it is amnesty, and it was only intended to sound enough like it wasn’t to slip it by the base.
Pretty much the same with Trump. That Trump hasn’t said how the return would be expedited, but has repeatedly said it will, just means his plan isn’t as thought out.
Deported in order to bring them back magically legalized on an “expedited” basis is, yes, a touchback amnesty plan.