I honestly don't read all your spam every day (who could possibly read it all and still keep a job) and so I sometimes need you to cite your source. Should be easy to do. I note you do this when it suits you, and when it doesn't, you say "go find it".
But, regarding the source you provided, I'll note that they use an amalgamation of many sources to come to their "conclusions". These "conclusions" are vastly different than say, Israeli or other country reported data - making one or the other suspect.
Second, and most importantly, the
CDC itself mentions this regarding US Breakthrough cases, which is very interesting:
The findings in this report are subject to at least two limitations. First, the number of reported COVID-19 vaccine breakthrough cases is likely a substantial undercount of all SARS-CoV-2 infections among fully vaccinated persons. The national surveillance system relies on passive and voluntary reporting, and data might not be complete or representative. Many persons with vaccine breakthrough infections, especially those who are asymptomatic or who experience mild illness, might not seek testing. Second, SARS-CoV-2 sequence data are available for only a small proportion of the reported cases.
These flaws in data collection at the CDC level are likely amplified when trying to collect "aggregate" data and forming conclusions as the KFF source you provided does. Thus, the "conclusions" are almost certainly flawed, and cannot be used in any other than entertainment value.