I’m not comfortable with that statement.  A better summary might be “Geothermal drilling/fracking has not caused significant earthquakes and there is little reason to believe that it might.”

Drilling for oil and natural gas can trigger small tremors.  There was an incident which made the news this last year when a natural gas well drilling was followed by modest shakes in an area which had not experienced prior seismic activity.

I do agree that the tremors have been small and most likely are not a significant problem.  (As long as one avoids more risky areas such as Bern, where there was a known fault and lots of infrastructure that had not been brought up to current standards.)

But I think it important to be very upfront about the issue.  To deny any sort of tremor opens one up to a loss of credibility which could result in a setback of future installations.