Well its not exactly true, but at the levels mentioned It would make little difference even if it was I suspect. Having worked with radar engineers on all sorts of different bands gear they seem to come to little harm even if they do what you would not be allowed to now, demonstrate warming a sandwich on the desk using a horn antenna. Look at the folk on lifeboats walking the deck within feed off the radar which is on at the time. if there had been an issue one would have heard about it by now. Mind you if you aimed the output from your magnetron at your wedding tackle you would probably not have many children.
X Rays can be dangerous. In the early days of Colour tvs, as many will recall, you almost needed a live in engineer and one of the main makes was Bush. They had an unfortunate fault condition where the valve that drove the beam and generated the 30,000 volts eht went into a mode where X Rays fired straight out the bottom of the cabinet, and there are anecdotal stories about pets getting cancer and all sorts as they lay between the legs of the set. Eventually a lead cover was used under the offending component, but many service engineers wore radiation monitors. Brian