Then why bother remodeling the Silver?
I've noticed the bots will almost always try and play the cards in their hand, even if it's a really bad idea. This is why Masquerading a Rats into a bot's hand can destroy their deck...
In this case, the bot's "don't end when far behind" coding seemed to stop them 3-piling, but didn't actually stop them from playing the remodel. Ouch.