Boy the new cars really jamb everything in there with no room to get your hands in, almost like they designed it to discourage DIY and force you to take to dealership. Great detail on replacing the alternator , good thing the serpentine belt was good as those are a pain as well.
So did you change out the pulley for the tensioner. Most likely should be done at the same time with the belt. They always go together in my experience. RAV4s for sure a duo job 🎉