50% of the graduates of Modern Orthodox high schools are no longer Shabbat or Kashrut observant
That implies that they once were Shabbat and Kashrut observant, unlike the theories put forth by some posters here.
However, this study, even if true, does not disprove, in any way, the validity of Modern Orthodoxy as a legitimate path towards avodas Hashem. Modern Orthodoxy, widely considered less stringent than “right wing Orthodoxy”, might very well simply be more appealing to those who tend towards lesser observance.
In other words, what hasn’t been demonstrated is what is the cause and what is the effect.
I personally do not agree with many of the ideals espoused in the name of Modern Orthodoxy, but this study, if true, would still not support my opinions.