No, I think it means that the patents will never end up in the hands of people that just plan to use them as weapons to extort other companies vs. their actual useful purpose, which is to protect innovators from having their hard work ripped off.
Twitter can still use the patents offensively if the engineer whose name is on the patent agrees. They're just committing not to do so against the will of the inventor.
Does this mean that you will be able to use any Twitter-patented technology at will and not expect to be sued for it?