Statistics don't do irony
As has been said, in a purely pedantic sense, this incident was ironic but from a statistical point of view these FAA inspectors faced approximately the same risk of failure to their aircraft as any similarly legally maintained aircraft of that type with the same hours on all components.
As to whether it was tasteful to raise the subject, well taste is a subjective issue.
As an aside, I am not a heli pilot but as a humble fixed wing PPL I know that I am always most conscious of the possibility of aircraft failure immediately before maintenance and immediately afterwards as well.
It that ironic? No, just good sense in my book!