I also saw the program you described, and I remember them also describing Aikido as "the art that best preserves the spirit of the Samurai". In fact, that's what I remember the most about the piece they did on Aikido. Included in that was someone practicing Iaido.
The martial art I train in was also featured as the "most" something else, and personally wish they had left it out, so I presume there were lots of other discrepancies about the other martial arts they featured. For example, I believe they said the Kung Fu was the "most spiritual" if I'm not mistaken. Yes, these things on TV are usually very badly researched and should always be taken with a grain of salt - even when something positive is said.