I read it the same way.
Page 2 of document you linked:
In December 2017, after becoming aware of the strength of the government's case, and while the Capital Case Committee was considering whether to recommend that the Attorney General seek a sentence of death, the defendant's attorneys took part in plea discussions wherein they sought to guarantee the defendant the minimum sentence. Defense counsel, however, refused to accept the condition that the plea agreement be made contingent on recovery of the victim's remains.
A draft of a conditional plea agreement was sent by US authorities to defense
[see attached]
Defense responded with modifications:
[see attached]
Prosecution requested clarification:
[see attached]
Jan. 15, 2018, defense sent letter to Attorney General: defendant would agree to enter guilty plea in exchange for life without parole. AG responded by directing US Attorney's Office of Illinois to seek sentence of death.
A plea of contingency that required successful recovery of victim's identifiable remains was rejected by defense attorneys.
Defense has implied defendant was demonstrating acceptance of responsibility by entering a plea negotiation based on willingness to plead guilty. Prosecution disagrees and believes the defendant offer is questionable relating to acceptance of responsibility and not disclosing location of remains.
If defense is allowed to bring the misleading plea agreement up during sentencing, then prosecution should be allowed to respond about the incomplete negotiations.
Prosecution requests all facts related to those negotiations be excluded during guilt/penalty phase.