I was frustrated like you to see that with the new year, VMware now has a new "version" of VCP even though it's still based on the exact same exam. Also like you, my VCP5 no longer is good enough to re-certify using just an exam (kicking myself to for not getting around to taking the exam before the end of the year). It is beyond frustrating to see that there will technically be a new VCP "version" every year even if there isn't a new major product release or new exam. I'm really not quite sure what value a VCP 2020 has over a VCP 2019 if the requirement to obtain both certifications is 100% the same.
In regards to clearer information, the VMware Education team did just post this blog article the other day which is much clearer on the new policy: Certification Upgrade Policy Update - VMware Education Services
Ironically another blog post Also kicking myself for not doing this last year. They truly need to clarify why they mean by version. The year you get certified is not a "version" If someone took the 6.5 test in 2019 they were not tested on the same material as someone who took the 6.7, yet they have the same exact cert. On top of that the 6.7 test is all based on 6.7 U1, which came out in 2018. Its not even like they are making an effort to update the tests along with the version updates.