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I believe the key word is ALWAYS.

So if you have 6/10 units in Terminator armour, those 6 can go in reserve (but the remainder would have to be deployed), if you have 10/10 units in Terminator armour, those can all go in reserve too, since they are ALWAYS able to do so.

That's my take on it

I read terminator's "may always" as shorthand for "may do this even if the mission does not include reserves" and the new rules did not change that.