Waveshare 1.28inch Round LCD Display 65K RGB Colors 240×240

That's some nice work there, thank you for that! I have a hopefully easy Q. I am simply trying to identify the display that I have, a round 1.3" (probably a GC9A01) but I don't think I've got the read part of spi correct. I'm trying to ure spi.send:
let c = new Uint8Array([4,0,0,0]); JSON.stringify(SPI1.send(c,CS)); assuming SPI1 and CS are initialized correctly, should that code return the manufacturer information (command is 0x4, returns 4 bytes)?
I've tried it on a known GC9A01 and it doesn't work. Bad syntax? Do I need to lower DC? any help appreciated!