I do agree that time dilation occurs, what I disagreed with/corrected was with this: it could travel almost any distance before decaying, which I took to imply that the lengthening of particle lifetimes was not measurable in the way that you just pointed out.

In retrospect perhaps the parent comment was saying theoretically it could travel any distance which is true, but doesn't really help in estimating whether it could clear nuclear radii or not.