That doesn't exactly counter my sentiment. That a manager changed things in a game in a way that fans noticed and it notably worked for him doesn't mean that everyone is suddenly right when they put forward the argument that their manager doesn't have a plan B. That a manager talking about his...
"no plan b" seems to be a common complaint of managers at various clubs. It's almost as if it's a pointless cliché uttered by people trying to make themselves look more knowledgeable about tactics than they actually are.