so from what i understand, you are saying that the events of secret wars 2 #6 (when beyonder killed death) took place after FF #319 (the issue where MM made the statement), correct? i disagree.
History of the marvel universe (2011), confirms that the secret wars 2 events (one of which, beyonder killing death) takes place before the FF issue (when doom and the F4 traveled to the beyonder's universe, same issue where MM made the statement):
http://i.imgur.com/kNgCXMC.jpg?1
2009 beyonder bio (from the marvel encyclopedia) says as well:
http://i.imgur.com/YIMwCOY.jpg
Beyonder's 1993 bio makes it pretty clear that beyonder killed death BEFORE FF #319:
http://i.imgur.com/DnBhKQR.jpg?1
^see? the encyclopedia/hanbdooks show that all the secret wars 2 events (killing death included) take place before the time when beyonder and molecule man merged (ff 319), same issue where molecule man stated that he and the beyonder are below eternity and LT, same issue where they were retconned.
that LT bio (which btw is from all new OHOTMU #6 not 4) in fact, contradicts your argument, since it clearly shows that beyonder killing death takes place before the FF issue (if you take a close look at LT's chronological appearances, you'll realize this).
so no, the beyonder/death scene wasn't years after the MM statement. It CHRONOLOGICALLY takes place before the statement - before the retcon - before ff 319