Is the system prompt "open" as the engineer claims in his tweet? Seems we'd have more definitive reporting of the change if it was openly published and recieve

Is the system prompt "open" as the engineer claims in his tweet? Seems we'd have more definitive reporting of the change if it was openly published and recieved two big changes, no? edit: googling it seems it's not as there's various people discussing the versions they've managed to get Grok to spit out which would be redundant if it was open. So the lead engineer is telling blatant lies when discussing a blatant, political bias applied to the product?