Different opinions can be voiced in the party itself, democratic centralism is summarized as "diversity in opinions, unity in actions" ideas can be freely discussed, debated, voted, compromised on, etc but once the party reach a democratic consensus the party as a whole must go through with the decision unless the party as a whole change it's mind democratically.
Well Iām not going to travel to Cuba for the sake of an internet discussion
You don't need to, it's very easy to find documentation on the subject for free online if you are just willing to actually learn about it.
But it is true that political opposition is forbidden and the only allowed party is the communist, right?
No it's not, not only are other parties and independent candidates allowed, but the communist party isn't allowed to present their candidates to the elections because candidates to the elections are not nominated by their party but by the peoples of their community, the communist party do end up having their members picked for the elections because the party is overwhelmingly popular but there is nothing to guaranty that any of them will get in.
No, clearly you don't understand what they meant, nor how Cuba's political system works. Please educate yourself before confidently calling dictatorship a country who's political system you couldn't explain the most basics of.
It's funny how instead of talking explicitly about the way the American state works and looking at the effects of Trump's vs Biden's policies based on their previous terms their all "argument" is repeating that Trump will definitely be worst with no actual explanations and making barely relevant metaphors like the trolley problem while ignoring that it's an oversimplified thought experiment that isn't universal relevant.
Different opinions can be voiced in the party itself, democratic centralism is summarized as "diversity in opinions, unity in actions" ideas can be freely discussed, debated, voted, compromised on, etc but once the party reach a democratic consensus the party as a whole must go through with the decision unless the party as a whole change it's mind democratically.