My understanding is if they're offered to be used on fire-resisting doorsets, then they must be CE marked under the CPR. So, if they aren't legitimately CE marked they shouldn't be placed onto the market for that purpose anywhere in Europe. Looking at the website you might infer that they could be used on such doorsets (especially given the colours and design used), and it does say "fire tested" but I couldn't find a specific reference to suitability for use on fire doors anywhere?? Very limited market if they couldn't be used on F/R doorsets!?
Anyway - variation on a spring hinge so might struggle to close a door over a latch, especially if it's knackered and/or the door hasn't been opened fully? Perhaps they'll turn up at FIREX & let us have a play!