You are right, nitrosamides can also be of concern (although outside of the current scope). Nonetheless, they are normally difficult to form, and in many cases, not very stable.
A Nitrosation test (NAP) can help you identify whether the formation is feasible or not. Available for purchase on websites is not a proof of it being possibly synthesized. Many vendors have grabbed all APIs with amines / amides and just added the NO. If there is interest, they will try. What I mean is that they may have never even attempted anything before putting them on the web