No, it just mentioned that their equipment was stolen, so they came up with the idea to use their iPhones, and perform (practice, whatever) on the subway.
Marketing Genius!
And, it sounded good... especially as they got into it, later on, with harmonies, etc...
To me, it was the epitome of making the best out of a HORRIBLE situation! Imagine, if your band's entire equipment had been stolen! I personally know at least TWO other bands, where this actually happened... where the whole truck of equipment was GONE! I think it was brilliant, to turn it around, and have a horrible circumstance, work in their favor instead! Shows a good attitude, and it shows DEDICATION, that they all stayed the course, and turned this into something that could work in their favor, instead of moaning and whining and cursing life!