If you look at the video, you'll see that "Software Should Be Perfect" is the title slide of the talk (you don't even have to click play, it's there at the start). And then the first words out of the speaker's mouth (other than a sound check) are "I'm going to try to convince all you that software should be perfect".

The "original title" you're referring to is what the person who uploaded the talk to youtube titled the talk, not what the speaker titled the talk.