These aren’t synonymous either. Freedom of movement still comes with restrictions.
“Freedom of movement” is a defined thing. At least know what you’re fighting for.
It’s not, though, about worrying about an inconsequential flow of people who are subsequently restricted to the grey economy.
And besides, this “taking back control” thing only exists in your imagination, which is exactly why it’s so ill-defined. The rest of the population has been discussing freedom of movement — you know, the actual thing the EU insists on — not “taking back control”.