Since you clearly failed to read the report
Sounds like I'm not the only one who can't read:
According to reports, the aeroplane experienced a depressurisation problem.
Ryanair's carefully-worded statement does not deny this.
If there was no depressurisation, then it's highly unlikely that a descent from cruising altitude to FL100, no matter how fast, would have resulted in a cabin ROD rapid enough to account for passengers reportedly being hospitalised with ear injuries.