He’s trying the title on for size. I’m not sure anyone has ever had a problem with that line.
The CinemaSins video for ESB actually reminded me of it, it points out that moment too.
https://www.youtube.com/watch?v=g_0yLbcV3U8
Most of the complaints are made in jest but I feel like he’s making a fair point when he says Luke immediately went “right into the acceptance phase of that shocker.”