Unpopular doesn't mean bad sales numbers.

If you listen to the white collar internet you'd think that nobody buys Nissan and FCA (I'm sorry, Stellantis) but that couldn't be further from reality.

Opel annual sales in 2019 was 800k, half their peak of 1.6 million in 1999 and there sales graph is basically a steady continuous drop in that period: https://carsalesbase.com/europe-opel-vauxhall/

The people who historically would have bought Opels or Vauxhalls (thanks to high numbers of UK imports, you used to see both here) now tend to buy Toyotas and Kias mostly today, at least in my country.

Opel is owned by one of the biggest car manufacturers in the world now, so it's more likely they are diverting parts to their more popular brands.

Probably, same principle though.