This is not of course Al Qurtubis views he believes rulers should not be fought unless they commit kufr bwah. This is merely him narrating a well known historical event. Btw Al Qurtubis tafseer with the tafseer Al Jalalayn of Suyuti(another) are popular with Salafis and Read on every mosque and university of Madina. So this is a moot point and unexpectedly low quality reply from you
The salafis need to take a harder line when it comes to Asharism and this includes a harder line when it comes to Qurtubi. I do not believe Qurtubi was from ahlus sunnah and I think this is lenient considering what he said in terms of aqeedah.