Well... I took a look at the Sharp Productions video and found a bit of a bombshell.
Right at 4:52.
Granted they could just be lightskinned. But the gloves they're wearing makes them look lighter. It's right in the thumbnail even. I could see how someone may think they're white given the contrast of the mask and the glove to the skin. But they're still darker than the usual person. Could it be someone white with dark foundation on them? Or again, someone simply just lightskinned.
In fact, the tweet in question is actually FROM this video! It's a screenshot from 4:54. Did this person even attend the event?