Federal employees have statutory no-cause termination protection, and the President presumably can't simply reclassify the federal workforce as "at-will".
Article II says: “The executive Power shall be vested in a President of the United States of America.” I doubt it’s constitutional for employment law to preclude the president from firing any executive branch employee. It’s quite possible it’s constitutional to have contractual remedies for termination. I suspect that’s why there’s an 8 month severance.
My read of this is that no 8-month severance has been offered, for whatever that's worth.