What's weird is if this isn't a legitimate way to test the Chicken, why did they get the expected results from the other 4 restaurant chains that were tested? They used two independent labs to verify the results, and both times the results indicated significantly less chicken in the subway "meat". According to this article about the testing they tested 3 samples taken from 2 sample sandwiches of each of the products tested (3 from other companies and 2 subway sandwiches). The subway meat was such a large outlier that they initially thought there was a problem with the testing so they tested 5 additional samples of each of the subway products but got the same results.
In any case, the testing certainly seems to show that there is something significantly different about the chicken procured from Subway that was tested by the labs.
No organization wants to defame another, or get sued for wrongful information. You can rest assured that they found that the chicken they had was factually 50%+ of soy. Was it Subway, or their contracted meat supplier who may have adulterated the ground chicken so that it would pass through a slicer without disintegrating.