[I just noticed that you are asking about the Stellar GCD, I’m pretty sure my answer below applies to it as well as the DS.]
PS Audio uses “standard” I2S (Bit clock, data and left/right. Nothing else, no protocols, etc.) The I2S profile page seems to be not for the DAC but for the HAT you might be using - none of the options apply for PS Audio DACs.
The DS doesn’t have any configuration settings for I2S. There’s no concept of opening and closing the I2S connection. The DS doesn’t care about 16 bits vs 24, vs 32… The DS doesn’t support anything over I2S except audio (e.g… don’t use the I2C lines and there’s no mixer, etc.) The DS doesn’t need any signaling except the raw audio. All of these issues are issues with your I2S source and we aren’t the best ones to debug that for you. Perhaps someone else here has a similar configuration to yours and can chime in with suggestions.