Fair chance if you're flying into an airport frequented by scheduled airline traffic otherwise............. And then there is the trust that a pilot places in radio calls from PPL or microlight pilots (not having a go, just suggesting those with less experience) in a said MBZ particularly if they are operating in poor weather (probably with a high workload).
Besides, I think the MBZ comment is a moot point somewhat. It's see and be seen not hear and be heard.