Doesn't appear to be true. Here's a link of organizations participating. http://www.ready.gov/america/npm10/members.html#link2
I didn't see any of the WTS legal entities listed. Also, I'm not sure how the 501c tax statue requires that those using it must turn over all the details on all the members. Seems far fetched to me.
Clearly the WTS would do it if they needed to in order to keep their 501c status since they have a history of throwing anyone under the bus they deem necessary to accomplish their goals. But, I think the source is highly suspect.