Apart from the fact that nothing that I noticed actually supported it being planned that way. Next week could change that.
Incidentally, doesn't a transmat beam, even an extremely high powered one, getting into the Tardis, contradict past continuity? (And wouldn't the story have worked just as well if they had been grabbed as soon as they came out of the Tardis somewhere else?)
(There a sort of connection in that a comment (that I can't now find) I made earlier about a book involves something getting into the Tardis, and once [SPOILER] is revealed rather later, it suddenly made sense to me.)