These are the most striking phrases, directly referencing the role. It's hardly a subtle hint...
"Night 1. Assuming I'm a maniac, I'm sitting quietly. But who am I supposed to kill if I'm a maniac? The roles are unknown. (...)I revealed my logic, assuming I'm a maniac, in a note on the sixth night."
And the main thing: what's the point? I was exposed! Why put on a comedy? I couldn't even imagine that an exposed role could be further exposed.
If his opinion differs, why not? The main thing is to justify it.