Point well made, but I think they were trying to correct the usage of Responsibility. Responsible = Who does the work, which, of course you can outsource.
Exactly. This blog post is really about the difference between “Responsible” and “Accountable“ in a RACI. I jokingly define RACI’s R and A as the person who “Really does the work” and the person whose “Ass in on the line” when the project fails.