If Maduro was holding Bitcoin instead of gold, specially gold outside of your borders, he wouldn't have had that little problem. Of course Maduro is probably too computer illiterate to get the thing done.
You could make the argument of "if he was holding his gold inside his country he wouldn't have been denied access". Well still, it would make sense to hold Bitcoin and not gold, specially when you have an empire like US always threatening anyone with entering your country and taking all of your gold and oil reserves as they will do with Venezuela. With Bitcoin they couldn't be able to take them as you could have safe backups overseas.
This is an unbeatable logical argument for the bullish case of institutions holding Bitcoin. Im not saying they should dump all of their gold, but definitely dump a certain % and diversify with Bitcoin. This will happen sooner or later, and it just takes a first mover for the rest to follow, they will not be able to afford not having some due game theory, similar to not having powder back in the way when when wars were fought with swords.
To be fair, he probably already does. The fact that he has shown interest in cryptocurrencies (even though the Petro is essentially renowned as a scam at this stage) means that he likely has some BTC in reserves.
But I think that your point still stands. Firstly, bitcoin can be transacted with much easier compared to gold. Especially with moving large amounts of it. The liquidity that is within the bitcoin market is probably no less than the physical gold market, either. Governments who hold bitcoin instead of gold also won't have issues with storage, and in this case, being blocked from accessing the gold since bitcoin is trustless.
Perhaps governments and central banks are still concerned about the volatility of bitcoin compared to gold, which is a valid concern given that they may need the assets to perform monetary policy at any given time. But I still think that in a few years, more countries will hold bitcoin because of the increased liquidity given by institutional investors and the increased stability as the market matures. But that's not to say gold isn't a good store of value, it still is, and it will continue to be. But custodial concerns are present with it, no doubt.