Hello,
I looked into that Support case you noted and found out that it was corrected on the 12th of October. It was handled by a newer team member, and his initial understanding was incorrect and has since been corrected.
My apologies for the confusion. I can confirm along with other members in this community that the only prerequisite for a CR is the base version itself. So if you have 9.2, you can apply CR5 directly to it without needing any of the CRs that came before it. It's a "Cumulative Release" (CR), so the changes in CR5 include all the changes from the CRs prior to it.
Sincerely,
Dustin Dauncey
Sr Support Engineer, Global Customer Success
Email: Dustin.Dauncey@ca.com
Phone: +1 800 225 5224 ,48385
Phone if outside North America - https://tinyurl.com/CAContactSupport
CA API Management Community: https://tinyurl.com/CAAPIMCommunity