Cool, so now can I talk about how my former employer offered me severance only if I signed something not to talk about it because I was about to file a long term disability case and they knew it?
Your right to talk to a lawyer was never jeapordised. Your right to complain to the NLRB or threaten litigation/arbitration was also probably never in question. (Your claims may now be strengthened or expanded.) Your right to disclose it publicly, e.g. here, may not be protected.
but I cannot sign a contract to "sell myself back into slavery"???