"have rules about unaccompanied singing only, which is a stylistic restriction."
No it isn't - virtually all the finest singers in Ireland are unaccompanied and are stylishly superior to those who choose to accompany themselves.
At the present time, the repertoire being sung here is one that needs no accompaniment - the attitude by club organisers towards instrumentation has nothing to do with restricting style and has far more to do with making sure the music doesn't follow the same disastrous path that has been taken elsewhere.
If you have a point to make about Comhaltas, why not make it publicly instead of alluding to secret messages and slandering one of the most respected long-time stalwarts of the English folk scene - you must be doing your own career a power of good with the way you are behaving!
Jim Carroll