I can’t agree more with the content of your article (yeah Design Sprints are great) but please: why this provocative title?
I don’t think pissing off the whole traditional UX community can bring anything good. (Especially when Design Sprints ARE user Research, just in a more condensed way) also think about all the folks who will read just your title and not the content of your article ;) no hard feelings here but you see my point.
Traditional UX agencies are still relevant when it comes to deliver an actual project. Design Sprints are a different breed: they are great BEFORE the project even starts.