Yes, apparently they have suspended the route to Asakusa until further notice. It is as easy and cheaper to take a Keisei line train to Ueno, then change to to Ginza line to Asakusa, or better a Keisei-line train continuing to the Asakusa-line (direction Haneda airport or Nihombashi), which stops directly at Asakusa. It cost about 1000yen one way (3x cheaper than the bus) and takes about 1h10min.