Mod-95: Thank You for allowing those two links. The EDAH article was from a 2005 issue of their journal. Rabbi Willig came out with his halachic prenup approximately circa 1999. So Rav Elyashev’s strong halachic objections certainly apply, even if there have been minor modifications of the legal terms of the current prenup. The reason given by RYSE for his objections still apply.
Also, there have been no significant changes to the RCA/BDA prenup between 2005 and 2012. Certainly nothing substantial to change its halachic problems.
And the JPost article from 2005 noted that the Chief Rabbinate of Israel, at that time, refused to allow prenups due to Rav Elyashev’s halachic objections.
I’ll also just note that one of the links not approved was to the site of Gil Student, a known MO blogger rabbi who supports the prenup. He acknowledges the fact that Rav Elyashev issued a psak against the prenup.