Ubiquitin, I did not see a search engine on the Aguda website nor did I find that quote on Google with the exception of your post. I did, however, find that the Aguda itself condemned the pesak. In any case, all it says is that the pesak was wrong. It does not say that he was disqualified as a posek.
As for the age of the Universe, has anyone actually read Dr. Schroeder’s article or the various explanations in “Challenge”? BTW, Rav Kook says that so far the Theory of Evolution is the closest secular theory to the kabbalistic description while adding a caveat that it may be replaced some time. He wrote (Shemonah Kevatzim 1:594):
?????? ????? ???? ?????? ?? ??????? ???????? ??? ??? ????. ??? ????? ???? ???? ??? ?????? ????? ?????, ???? ????? ????? ?????? ?? ???? ???????, ?? ??? ??? ???? ??? ???? ???? ???? ??? ??? ???”?, ??”? ???? ????? ???? ?? ????? ??? ???? ??? ????? ??????? ??????? ???, ?”? ???? ??? ?????? ???? ???? ????? ????, ???? ?????? ???????. ?????? ???? ????? ???????, ??? ??? ???? ???? ?????, ?? ????? ?????? ?? ??? ????? ???? ?????. ?????? ????? ?????? ?????? ??? ?????? ???????? ????, ??? ?????, ???? ????????? ??????? ????? ??? ??? ????, ??”? ??? ????? ?????? ??? ???????. ??????, ??? ?? ????? ?????? ??? ???? ??????, ??????? ?? ????? ????, ???? ???? ???? ???, ??? ??? ???? ????? ????? ????? ?? ???, ?????? ???? ????, ?????? ??? ???? ???? ????.
See also “Rav Kook on Noah: The Age of the Universe” on the ravkooktorah website.