My guess is that in a climate like Germany’s, solar isn’t consistent enough to provide the steady baseline power that coal plants can.
One of the complexities of power infrastructure is that demand must be met instantaneously and exactly. Coal and solar typically occupy different roles in a grid’s power sources. Coal plants are slow to start, but very consistent, so they provide baseline power. Solar is virtually instantaneous, but inconsistent, so it’s better suited to handle the daily fluctuations.
So, in a place like Germany, even in abundance, solar can’t realistically replace coal until we have a good way of storing power to act as a buffer. Of course, nuclear is a fantastic replacement for coal, but we all know how Germany’s politicians feel about it…
Unfortunately many North Koreans already leave the country to work as slaves for construction companies, factories, etc (including in Europe). Generally they only allow people out who have families back home to be tortured/killed in case they defect.
They will probably get some, but less than you might expect.