Blondie has handed out a Gantt chart for his project. (Probably created with MS Project, and printed on 8.5x11" with a 3 point font.) The PHB has no idea what he is looking at, and is desperately hoping no one will ask him to comment.
No, "agile" has nothing to do with the flexibility of the product or framework. It has everything to do with the flexibility of the process used to develop that product or framework.
Regardless of whether you practice "agile" or "waterfall" or something else, every change (no matter how frequent) needs to be coded and needs to be tested, or that change should be rejected or put off to the next release. Sure, you CAN ignore the testing, but all too often there is a greater cost when you do.
Hence Dilbert's reaction to the plan of releasing an untested product, a reaction that is wholly justified.
You really need to read up on the dilbert and peter principles. The peter principle states that if someone keeps getting promotions based upon performance he will eventually get a job he is incompetent at. And the dilbert principle states that incompetent people are promoted to keep them out of the way of the competent people. Both are sometimes true and both can be beneficial.
Now for helmeet. He was not talking about skipping testing but the fact that you can't predict the problems everyone will find because they either don't know everything they need or their needs will change so you extend testing for a while after the release of the program so you can fix the issues they find.