Yes. The problem is that most memory errors (out of bounds + use after free etc.) result in a vulnerability. Only a minority of the logic errors do.

For operating systems kernels, browsers etc, vulnerabilities have a much, much bigger impact than logic errors: vulnerabilities need to be fixed immediately, and released immediately. Most logic errors don't need to be fixed immediately (sure, it depends on the issue, and on the type of software.)

I would probably say "for memory unsafe languages, 80% of the _impact_ is due to memory vulnerabilities"