I suspect that a lot of passengers are unaware of those additional TG lounges, in C and elsewhere. Probably they through the priority immigration at the far end of the terminal, see the sign for the lounge, go down the escalator into it assuming it to be the only one. Perhaps one of the reasons why it is so horrendously crowded and the others usually, but not always, less so.
At least they are making some effort with the food. For 25 years they tried to get away with crappy sweet corn and mayo sandwiches and sugary danish. Now the food is passable, albeit barely.