That page is ludicrously wrong.

Saudi Arabia has far more oil than Venezuela.

The bulk of Venezuela's alleged "largest oil reserves" are tar sands, which take almost as much energy to extract as they contain.

Plus, Venezuela is having political crises that have reduced their extraction / production ability.  But even if they were peace and happiness they've still mined their best oil, just like Ore-is-gone cut down the biggest trees a long time ago.

I recommend a search for "Energy Return on Energy Invested."  Physical resources matter.  Geology is not subject to political opinions or debt backed digital dollars.