Guess, just guess: Shenzhen Concert Hall is state-owned, but now it is contracted to a private company and operated as a company. You can probably guess a thing or two by looking at their website.
As for the "Philharmonic Club" you mentioned, it is a clubhouse of Huading Culture Development Co., Ltd., which specializes in booking activities and renting venues. They charge drinks service and venue fees, and sometimes they are free of venue fees.
The Philharmonic Club is located on the first floor of Shenzhen Concert Hall. Go straight for 2 meters on the right side of the entrance and you will reach the door.
Bottom line: The public property of the concert hall is privately operated, and the Philharmonic Club is a Philharmonic Club, and the concert hall is a concert hall, just the same house.
statement: don't blame me for the above question about whether the concert hall is private or not.