Who said there are no immigrants? Every new year is a record immigration year. Also for housing prices.
The whole "we need even more immigrants" is wage suppression propaganda. Many of the big German business crying wolf have had record sales, only beeing kneecapped by the disappearance of cheap Russian gas and are trying to compensate it with cheaper labor.
I think German themselves made that race to the bottom when they selected cheap Russian gas as their main competitive advantage - as you very well noticed.
Do you think German manufacturing can compete with Chinese one once salaries grow?