Do we have members here who have at least the technique that is comparable to that of average concert pianists?
We have members that are concert pianists. Especially if you dig back a few years and spot those that are no longer heavily active:
Eg.
https://roberthenry.org/ - username is robert_henry
There are of course also outstanding performers that haven't given any evidence of a regular performance schedule, but whom I really wouldn't doubt are capable of doing so.
Other above mentioned names are all great pianists, and there are numerous members that can perform at a very advanced level but are perhaps not as well rounded yet, or haven't built enough repertoire to be able to perform multiple solo recitals without getting bored. Those of us who can play say 20-50 advanced works well are good pianists, our performances may even at times be comparable to really top pianists but its not the same as a concert pianist who may have a repertoire that's 500 works strong and can prepare a substantial work for performance at short notice.