Agreed.  It's still a good idea to maintain flexibility but really if you want to know where to move, copy rich people.  The only countries on the OP list that are experiencing wealth and by extension brain drain are the UK and South Korea.  Of those two only the UK is seeing anything extreme and it really has been obvious for decades that the UK has been in decline.
https://image.nostr.build/dcef988b23721466bcb0489cd964f239af1036af2585a966c1577fdb7fbc7a7a.jpg