Which makes perfect sense within this world, as Sheldon’s decision to ask for Amy’s hand in the first place was done with mostly himself in mind, and he even got slammed by guest star Stephen Hawking about his single-mindedness.
Because of course he called Hawking about marrying Amy.
But as it would naturally go, Amy did say “Yes,” without railing on Sheldon for that kiss, although she did advise him to stop telling everyone about it in relaying the fact that they’re getting married.
Amy’s choice felt tested later in the episode, when introducing Sheldon to her fellow brainy colleagues, as Sheldon was unable to allow Amy to be the center of the conversation, even within her own job circle.