Not true I have seen so called indigenous performers in the park before as well as religious minority singers. Probably better if people are not lumped into these categories, just call them Thais, and if they have no ID then sort it out.
Few are interested in classical arts so that's an odd 'blend'. Seems at odds with rather than smoothly innterwoven together. City dwellers it's aimed at are more interested in luktung/morlam and phua cheewit. They did a better job at Bang Sue station, concert again there on the 12th.