As said, no onscreen evidence. Thus, enter my interpretation:
Wouldn't happened to have been watching a bit of Stargate recently, eh?
Though it does paint a much more subversive version of the Trill species, I reckon would be very hard to cover up. What would happen when the Trill encounter telepathic/empathic species that might detect the subversion, or would the Trill's ability to influence thought mitigate this?