He doesn't say it because Peach comes to him

When he was about to explain his plan, one of his koopa troopas ran into the room. "Lord Bowser! Madam Kammy!"

Bowser turned to him. "What is it now? Can't you see we're in the middle of something?"

"Forgive me, my lord! But Princess Peach has just arrived at the gates!"

This was a surprise to Bowser and Kammy. Since when did Peach come to him? They then went out to the front gate and Peach was there with no mushroom guards or anything. Bowser opened the gate letting her in and went up to her.

"Peach!" He said to her. "Why did you come here?"