Because he said the only things opp could have in that spot were AA and KK, " that the best I could hope for was to be tied".

Given the read (which was correct) it is like flushing chips down the toilet.
I couldnt imagine not playing that hand with an All in unless youe are positive that you have that good of a read on here.

Granted AA is a 81% favorite over KK, but even if she has AK (34% underdog) or QQ (19% underdog) ..

so anything but AA and your a huge favorite, so unless your 100% sure of your read, go all in! .. i'd go all in with 90% sure.