Yup- that's true. Simply being in the country is enough to get you blackballed. It makes sense, however, as how are they to know where you went or didn't? Even though you are an honest upstanding person, there are enough nut cases out there that precaution is mandatory.
They are not picking on BZ, it's true of every country on "the list"
(edited for typos b4 I get yelled at