This was specifically targeted at mathematicians, and pure mathematicians are a lot more likely to be hired by the NSA than any of those other organizations tha

This was specifically targeted at mathematicians, and pure mathematicians are a lot more likely to be hired by the NSA than any of those other organizations that you mention. Engineers, programmers, and so on all already have to grapple with this issue with big defense contractors. It's more rare that mathematicians have to deal with it.