These are unreferenced in the CI and documentation, and have been since 2019 (see #17549).
I'm not sure the cppcheck is worthwhile. It takes a long time to run (I think this is why it isn't in the normal lints), and right now it only appears to find implicit constructors. The list of exceptions is out of date. But if anyone wants to bring it back at any time in the future they can do so from git history (and port it to Python).