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This is an overstatement, definitely. C is one of the few (main stream) languages where memory safety vulnerabilities are even possible. So if you batch C and C++ together, they probably cover more than 90% of all the memory unsafe cove written in last 50 years, which is a strong implication that they will contribute to 90% of memory vulnerabilities.
All that said, memory vulnerabilities are about 65% of all high implact vulnerabilities on Chromium project[1] and about 70% of vulnerabilities at Microsoft [2].
Well, lemmy is a place for much more cultured audience. We can appreciate a good shitpost (that does also hold some water).