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I don't know. This is the first I recall hearing of the charge.
I don’t think the Steelers made a formal complaint, but some players definitely mentioned the practice of piping in extra sound at Indy.
They have had that complaint many times.
I had more of an issue with piss poor ref’ing.
I think someone had some bets on the spread.
I have not heard about this charge against the Colts, either, but here in WA State there was a big deal made about the Seahawks stadium. It was determined that there was no hidden sound system, just fans who were as loud as hell.