It's quite possible. He can't deny the alcohol anymore, but he might try to smear his fellow commanders.
Spir is not a novice; he should understand that these "accusations" really raise suspicions about the Lizard, even if he doesn't portray him as Daizumi, but as an ally of Spir. I think that's what Spir is trying to achieve.
Or maybe he understands that we'll think that way and acted accordingly.