https://screenrant.com/friends-apartment-switch-cheat-change-theory/

The apartment switch in Friends is one of the series' most memorable moments, but a theory completely changes this. Let's take a look.

What a dumb "theory." Even if Chandler did peak in the shopping bag, who cares? It was before the apartment bet was in place, so he did not "trick Monica into switching apartments." At that point, how could he possibly know that Monica would bet her apartment? He's not psychic.