That's a bad theory about Bitcoin and that's one of the reason why Bitcoin can't be easily accepted by govt.
He is right, Bitcoin gives us an option to fully control our money. It's basically a freedom for everyone but doesn't always mean to do a bad thing like what you mentioned.
This is one of the things that hooked me on bitcoin, the idea that we should have a currency that is not controlled by anyone, especially our increasingly corrupt governments.
Perhaps if they had less control they'd be less corrupt as well.
As it's a freedom, so everyone could choose an option not to disclose their wealth or transactions. What if it is the corrupt govt who does that? What if they want every of their transaction to be anonymized? Does it make any difference?
The government can do that now, through the flawed over-classification of information. However if the government used bitcoin it'd be easier to track what they're doing. The problem with centralized power is that there's 7 billion of us and only a handful of power players in every government.
However, if in a far off future government gives up in fiat and goes fully bitcoin, we could have laws where public money gets tracked in the blockchain (tax money and such) until it leaves public control. Hell, if you paid taxes in bitcoin you can track that money for a while. Transactions in bitcoin leave some traces and government wrongdoing is more likely to be discovered in this way.
However if they didn't control our money in the way they do now, I don't think they'd be corrupt enough to matter, everything else being equal.