Only being told things by the tour guide is missing way too much.
But if you feel since you are already in Seville, you dont want to miss "打卡" Alhambra, then go for it. But as most every one who tells you, except one person, all tell you it is not a realistic idea and the tour would be very rush. Basically the way I see it is, you visit Alhambra, so finish "打卡" , but you probably have not gained much from making this tour which would be not only very tiring but gives you very little time to really appreciate the site.