UK citizen here. "High-skilled" worker, left the UK. Policies like this do not make me want to return.
It's difficult to comment on this one policy without contextualizing what's happened to Britain as a whole over the last few years, and a lot of it has been pretty ugly.
Many tech workers have moved to the USA, for example.
What would it take you to live somewhere else?
Should we expect a tech worker to halve their pay and move from LA to London if there was a better relationship between Britain and Europe?
I am skeptical that this policy has any direct bearing on your future decisions, but it is a pretty good way to make a political point as it's good to have outside perspective.