Is This The Best Stock Market Indicator Ever?

I came across an interesting article that says if "the percentage of S&P 100 stocks above their 200 day moving average" is above 65%, then it's a clear buy signal. My questions are:

1. Any thoughts on using this indicator for first screening?
2. How do I get this for NIFTY or Sensex?

http://www.advisorperspectives.com/dshort/guest/John-Carlucci-111128-Best-Indicator-Ever-Part1.php

http://www.advisorperspectives.com/dshort/charts/guest/JC-OEXA200R-111128-fig-1.png

Thanks a lot!