Notice once again they say: "NOT FOR RELEASE OVER US NEWSWIRE SERVICES"
That is exactly the sort of irrational paranoia that has me concerned. You read something like that and immediately assume it's evidence of some conspiracy to conceal the true extent of the problem from the American public. Pretty silly assumption, since it would obviously take very little time before US media outlets noticed if information was being released to the Canadian media and not being released to the US media (especially since many major US media outlets have offices in Canada and receive all the Canadian newswire releases), and so the company obviously wouldn't use such an approach if their intent was to try to conceal info -- they either conceal from everybody or nobody.
In fact, Menu Foods simultaneously released virtually identical press releases to US and Canadian media.
US: http://www.menufoods.com/recall/Press%20Release%2004052007%20US.htm
Canada: http://www.menufoods.com/recall/PRESS%20RELEASE%2004052007%20CAN.htm
There is one little extra sentence in the Canadian version, which has no bearing on the situation in the US: "A further seven varieties for Europe have been added to the recall list." The header information for the Canadian version also contains the Canadian stock exchange trading symbol for a related security "Menu Foods Income Fund (TSX:MEW.UN)"; this security does not trade on any US exchange. The byline for the US version shows the name of the US PR service that distributed that release, PRNewswire. The byline for the Canadian version shows the name of the Canadian PR service that distributed that release, CCNMatthews. The two releases are otherwise absolutely identical, including every detail of the recalled brands/flavors/dates. Companies with international operations normally have ongoing contracts with different PR distribution services in different countries. These contracts remain in force during a business crisis situation, and there is nothing sinister about that.