I mean, having the U.S. quite literally attempting to stag a coup and then maintain a government in exile for 4 years would put a damper on me giving any information to any U.S. affiliated institution, non-profit or otherwise. Edit: There is nothing preventing them from lying about the results. Other U.S. organizations have done it before.
That said, bourgeoisie democracy is a complete farce anyways, I get why BE is being a whiny little child though, it's no fun when the sucdems ban the ML party, but idk why the ML people assumed Maduro would be on their side. Their party runs the street orgs and military, they aren't just going to give them up to some nerds who read some books. Especially if their response to getting banned is literally interventionist theory from the U.S.
Ultimately it doesn't really matter how Maduro did in the elections (though he probably did win them because again, they run the street organizations). What matters is that Venezuela will likely not 'get better' under a neoliberal thumb. Venezuela is between a rock and a hard place. I don't envy the leadership or the populace there.