You don’t need frontier models and a research project to find memory safety issues in C. Rather the opposite actually.
True but C never went out of its way to highlight memory safety features and shut down (with a rather aggressive posture to boot) any criticism of the language with arguments revolving around this feature as if it was the Christ's second coming.
In lieu of finding out that there are in fact multiple memory issues in std is at least amusing and some might say well deserved egg in the face of the more, shall we say, enthusiastic defenders of the language.
There were also memory safety bugs found in Rust code without frontier models before. Note that I do not deny that Rust has an advantage with regard to memory safety (at the cost of other things, including supply chain issues), but it is massively overhyped.