That is inaccurate. In short, Russ Cox has been bashing cargo's approach of preferring newer versions and lockfiles and a SAT solver (or really an approximation of one).
Apparently making the dependency-manager's code simpler is a goal worth removing developer's ability to be expressive and removing security updates.
Apparently making the dependency-manager's code simpler is a goal worth removing developer's ability to be expressive and removing security updates.