I have not watched the video, but the title has put me off.
The UK is not ruined. And if it is not as good as it was, that is because of our appalling politicians and bad goverance over the last decade, and not because of illegal immigration.
A government that has been elected on a ticket of reducing immigration for the last 13 years, but has instead seen substantial rises, year after year, has surely failed.
That isn’t good, but it isn’t ruinous as the video suggests.