Quite the opposite. Agile is about testing ALL THE TIME and building incrementally. They have flown humans right after a single successful cargo mission. Did they have no further anomalies in the second mission? I seriously doubt it. Now they have a bunch of issues on the RCS and reentry rockets that can't possibly be entirely new (unless someone changed something and people have flown an untested critical component). Worse for Boeing, those components are procured from a third party which now they must be questioning how much QA went into them.

A surplus of agility is the last of Boeing's problems.

What does this have to do with anything? Are NASA or Boeing using Agile for any project related to this mission?