Not killing someone last night and making this story up today is a highly unnecessary gambit for Sorian, tbh. BUT, I can see one situation where Sorian would want to do it;
If they killed scum last night, and we killed scum today, that would leave 6 people alive at the end of the game. There's, of course, no guarantee that we would hit scum today, but it's still a small possibility. With this being a intentional move Sorian could guarantee themselves a spot in the last 5, though it would be much more dangerous for them as it risks getting lynched.
Dunno, as it stands that still seems like a risk too far for Sorian. I feel like they would of wanted to hit scum last night and then just coast to the end without helping us scumhunt the last few days.