Well, if he has, that's an even weirder combo, & flies in the face of NT teaching about the Sabbath, eg. Mk. 2:23-28; Gal 4:8-11, Col. 2:16-17, etc., quite apart from the fact that Jesus was raised on the first day of the week (eg Rev. 1:10). Kyriaki emera (the Lord's day) = Gk for Sunday.
So he's basically ignoring all the NT evidence for the actual day of the resurrection, which is a bit odd for a professing Christian. Basically, he's still stuck in the OT to some extent - a bit like vekky in fact regarding conditional immortality.