People, it's nice and all that X class or Y class soloed Z boss, but that doesn't make the boss "soloable". It makes it soloable if you play X class or Y class. What if you play class A or B?
These changes make it truly soloable for just about ANY class. That's why we're saying it's NOW soloable. Nobody said these fights had never been soloed. We're saying that now you don't have to roll a paladin or death knight to do it.
A rogue soloed Patchwerk at 80. That didn't mean Patchwerk was soloable for, say, a shadow priest.