I listened to it, because of these threads. (My Swedish is passive rather than spoken, understanding it isn't the problem.)
That quote is his answer to a question about people born here who commit crimes and live long-term on welfare; whether they can also be made to leave. It's not a freestanding statement about everyone born in Sweden to immigrant parents.
And the passage continues past where your excerpt stops:
"They have not become Swedes. It says Sweden in the passport, but they haven't been interested in becoming part of Sweden. That's a qualitative difference."
"Have not become" only works if becoming is possible. So the criterion he's stating is failed assimilation, not ancestry; and the write-ups of the same interview describe his programme the same way: remigration for criminals and the long-term welfare-dependent.
To be fair: that's still a subjective judgement about people's inner attitudes, which I've said elsewhere in this thread is arbitrary and I'd oppose. He also says he's prepared to "walk over corpses" on this, so I'm not selling him as a moderate. Extreme, yes. Ancestry-based, no. Those are different accusations, and only one of them survives contact with sources.
Podcast (Swedish): https://aljosja.substack.com/p/satter-orebropartiet-sverige-...
I feel like people are looking for a reason to be outraged and not the shape of the actual situation. It makes me skittish.