A centralized cryptocurrency under government control is a contradiction in terms, so it doesn't make any sense.
Simply, Maduro is trying to save the savable, still deluding the population a little with an unrealistic proposal while preparing the escape plans.
Too bad, Venezuela is a magnificent country and does not deserve the suffering it is going through due to incompetent and corrupt politicians.
Actually, centralised cryptocurrencies are not necessarily a contradiction. It's just that it makes no sense for anyone to make an investment or affiliation with any centralised cryptocurrencies because it essentially is the same as any other fiat.
I honestly don't see where Maduro is trying to go with the Petro other than trying to lure in investment from overseas to finance their regime and escape sanctions, potentially.
The thing with Bolivar pegged to Petro is that Petro is not backed by actual oil reserves, but land that has unmined oil reserves which need significant investment in mining to actually dig out of the ground. Tying the bolivar to this centralised asset will do nothing to help the hyperinflation going on within the country at the moment, in my opinion.