A couple of points.

The title is misleading. This discussion is not a review of Celtic Connections but only one concert.
Also, Celtic Connections is not and has never claimed to a "pure" trad or even a folk festival although it does feature many great exponents of these in several concerts too.

There are many other festivals which feature the so called "real thing". Smaller and less known ones, admittedly, but it's still a minority interest whether we like it or not.