Bro seriously...
MC specifically said that he is laying a trap and by the time the Mother Superior notices it will be already too late because he's like 15 steps ahead of her.. He blabbed all that sht to get fool the convent ladies into letting their guards down..
Just don't take every word at face value. If you still can't believe me then ask yourself this..
How can MC use the bloodstream wiretap from Moe?
Who did he use it on?
When did he use it?
Look back and you'll find answers to that. I personally have no clue about writing techniques and styles but at the very least, the foreshadowings in the convent mission is perfect and is a testament that there is more to the MC's wacky personality.