Well.. this is a very interesting statistic. The conclusion I can draw out of this is:
1. There is a higher chance of an UEFA team winning the world cup, simply because far more teams from UEFA participates when compared to any other confederation (13 teams till 2022).
2. For CONMEOL, since 4.5 teams are allowed, the chances are considerably less.
3. But out of the 11 finals between CONMEBOL teams and UEFA teams, the former won on 8 occasions. This means that in one-to-one encounters (where UEFA doesn't have the numerical advantage), CONMEBOL dominates the scene completely.
Yes your conclusions are right more or less, but keep in mind that these statistics refer to the entire history of World Cups. If you have a closer eye at certain periods of time, you can clearly see that the last 20 years (before Argentina's FIFA World Cup win now) were strongly dominated by UEFA teams. 2006, 2010, 2014 and 2018 all finals were won by a UEFA team and even only a single time the runner up was a CONMEBOL team (Argentina in 2014 against Germany).
Whether I would say that CONMEBOL dominates the scene completely is, even statistically spoken, probably wrong (given that it is 11:8 for CONMEBOL).
Though the statistics are still interesting when you take into account all the other facts like number of participants per association and so on. I didn't know all of that before in deeper detail, so it was fun to dig a bit around and understand it better.