This statement really calls the credibility of the source into question. As time passed after the bombs went off on Monday, the level of "sophistication" declined considerably. Remember the initial reports of 6-10 additional bombs found all over downtown Boston, and the unconfirmed reports of cell phone service being shut down to prevent additional detonations?
By the time the suspects were identified late Thursday night it was clear that this wasn't a sophisticated attack at all. There were only two bombs after all -- and they were dropped right there at the scene by the two mutants themselves just minutes before they explosed. Their names and photos were posted all over the internet within minutes, because they didn't even try very hard to hide their identities.
I think that was just youthful naivete and arrogance. How many times do we hear about young people posting videos or photos online that end up getting them arrested? They live their lives publicly through facebook, etc., yet think they have total privacy. As to the sophistication of the bombs....I'm an electrical engineer, so I'm a little biased, but using an RC toy as a transmitter/receiver remote trigger is about as basic as it gets. In fact, I'm surprised that the bombs didn't false trigger with such a cheap setup, more evidence to me that the bomb builders really didn't have much of a clue as to what they were building.