That 80% figure came from Friedrich Merz in a press conference with al-Sharaa. It's apparently roughly the percentage of Syrian refugees in Germany that don't yet have a more permanent status and could conceivably be "sent back".
It's also frankly ridiculous, because that number represents a theoretical maximum of people that could be "sent back" (I hate this polite euphemism, so let's call it what it is: deported), not a realistic goal number.
At least in Germany asylum seekers have to be judged on a case-by-case basis, considering individual circumstances, so a blanket statement of "x% of Syrians will get deported" is far-right populist bullshit. Not that they won't try of course...
Pfff chrome fork 🙄
I for one use WolfCum a fork of LibreWolf (which is Firefox without AI bullshit), that's optimized for jerking it to anime feet