I feel there is some information missing about the agreement. An agreement is normally made by two parties that find that they get some benefits from the agreement.
Hyperion get the rights to the OS, but what did Amiga Inc get out of it?
Did Amiga Inc realize they were in deep sh*t, and just made the agreement to avoit a counter-lawsuit? 
And who is paying for the lawsuit anyway - lawyers are far away from cheep. Amiga is claimed by many to be near bankrupt, and I guess Hyperion havent been making to much money on OS4 sales to pay everything either..