Maybe? The current Iranian government is nationalist and anti imperalist, but I can see how many people would be against it in ways. Venezuela has a good government, but there's still the issue of corruption and economic turmoil.
Cuba is a rare example of a South American state having such a thorough and all encompassing revolution that basically the entirely of the population was on the side of the revolutionaries.
That being said, this data is definitely biased heavily and even with the bias it still shows a clear picture of the socialist nations having significantly higher popular support than the capitalist ones.
I doubt the data collection is flawless but I do know that Iran had pretty low voter participation in its most recent presidential election which typically indicates low faith in their government and venezuela is in a lot of foreign debt while also being under constant threat from the cia which is likely doing everything they can to destabilize the country in it's free time. So I wouldn't say it doesn't check out
there is probably apathy and discontent in these countries towards their governments (in part due to western sanctions) but as others are saying, sampling bias and all. i do not think if you ask the protesting Indian farmers they'll say the Government works for 'most' people.