It's interesting data, but not really very enlightening.
Rotax = 447, 582, 912A/F/S/iS/UL/ULS 914F/UL and probably other variants
Jabiru = 2200 and 3300
Others = ?
Of course installation plays a big part in reliability too, so how many variations do all these account for?
Looking at the data from flight hours/landing perspective, you have 0.45hrs for Jabiru, 0.49hrs for Rotax and 0.50hrs as a fleet average, so clearly the use profile for Jabirus are different from Rotaxes and just what is it that's bumping the fleet average beyond even that...?
The data might be enough to trigger an investigation, but enough to destroy a company's reputation in public by regulatory sabre rattling?
There's certainly a case for more information required before proposing a case for regulatory action. And this proposed action? Just what comment should the public make without any concrete data or information?