I find it quite believable, seeing how the Venezuelan govt simply issues orders to all ISPs to block the IP ranges of sites that make them uncomfortable; a famous victim is DolarToday.com, a site that tracks the black market currency exchange rate and now publishes unflattering news and opinion. I'd include a few traceroutes but I'm posting from my phone. Even pastebin.com was blocked for more than a year (haven't checked recently) because a list of URLs with leaked emails wad posted there.
Currency black markets are not "unconfortable", they are _illegal_. I'm sure there are examples of censorship in Venezuela, but that's not one.