Radio part of ILS equipment for Cat I beams the same signal as Cat III ones. The main differences are airfield LVP procedures, higher requirements for ground lighting/markings and of course tougher standards to be met during flight-test of ILS. So you can't say Cat I ILS does not provide guidance below 200ft. It does, however crew should not trust this guidance and monitor Cat I autolanding carefully by visual means.
However I'm not sure if DME part is required to make an autoland. EPKT has Cat I ILS without DME, only markers.
Some additional statement from the news (source:
onet.pl):
"According to pilots testimonials, during the the final part of landing contradictions of instruments readings have appeared, but there was no time to solve the doubts".