Don't know about the NamUs' rule-out list, but both Barbara and WCJD has DNA available, so this should be a rule out by default.
The rule-out by default is a bit of a fallacy. It's one of the reasons biometrics are no longer viewable by the public on NamUs. DNA Available doesn't state what type of DNA, where it came from or the quality. Black Creek Jane Doe has DNA available but insufficient for profiling. I agree that some possible matches, heck, maybe even most, could be an automatic DNA rule-out but I wouldn't let that stop me from submitting a possible match I felt strongly about.