The IRS rarely gets involved in snagging evidence from state-level cases, unless the IRS was already investigating the person (which I doubt they were in Micon's case).
I doubt he will see IRS issues out of this.
The NGC is unlikely to report this to the IRS, because they want their own conviction, and don't really give a crap about tax issues. Nevada also has no state income tax, so the state did not lose anything by any possible under-reporting of income.