Just a reminder: Ryze has been below the balance framework's buff thresholds in almost every patch this year (based on the public data). I made a post about that here.
As far as I can tell, he was only above thresholds in 10.1, 10.2, 10.3, and 10.7. All of these are from the pro bracket's presence thresholds, except for 10.1 which also showed sufficient elite bracket presence to avoid nerfs.
My understanding is that buffs are mandatory if a champion has stats below all thresholds. However, this hasn't been the case. Ryze has received only 3 sets of balance changes (10.6, 10.8, 10.13). Even if the balance team was being extra cautious (as they should) and avoided consecutive patches of buffs, they could have more than doubled the number of balance changes.
This isn't me saying "Ryze is weak", "Ryze is OP", "Ryze is handsome", or any other sort ...