From my reading, this ruling doesn't give the president any extra authority - he can't make new law, he can't ban a candidate, etc. He's just covered from criminal liability for doing stuff he has authority to do. He can't be accountable for giving an order to kill someone in his capacity as CiC, but if he simply orders the DOJ to arrest them, the court system would have that unconstitutional act overturned in no time, because he had no authority to make that call.
So from what I can tell, this gives the president the go ahead to skip lawfare and jump straight to murder. That's their best option. You can't overturn a bullet on appeal, and the person who gave the order isn't liable for that order. Biden could (in theory) have the election and scotus, and for that matter, congressional balance, solved overnight if he so wished. That's a scary amount of power to give someone.
He could, in theory, order the deaths of every republican in the country.
I don't want my president to have that power. You guys are cool with that?