"and will have concluded trade deals (with the EU) by the end of 2020"

Are you sure of that? I hope you're right.

There is lot of talk of a minimal deal on the EU side. It is possible that a deal of some kind is done by the end of 2020 that is just a phase of a much longer set of talks. That would enable both sides to claim they had met their goal, which is often how these things work.