It is recovery from the SS and O/U work but not full recovery - or you CTL would drop to much - it works - the first few days of a recovery week still feel pretty tough (if you have been working hard the previous 5 weeks) but by Fri/Sat you should start to feel good and ready for the next phase…trust the plan - it has always been like that for me!
Listen to your body. If you need to dial back a workout you can, don’t worry about your CTL dropping significantly or losing fitness—it won’t. Nows the time to realize the load (gains!) from the previous 5 weeks! Nail the recovery week and get ready for Base 2!
I’ve always had better success using recovery level workouts like Pettit -1 or Lazy Mountain during recovery weeks. I think the prescribed workouts are definitely too much intensity on average, but it’s something that varies person to person.