The word “possibility” can be used in two different ways: ways that are quite often confused and conflated, leading to some huge errors in thought. This is even done by very intelligent people.
One way has to do with our uncertainty about the future. Due to our limited prediction capabilities, we often look at and call future events in which we think at the time “could happen” as a “possibility”. This type of possibility I’ll call “epistemic possibility” as “epistemic” assesses our “knowledge or lack of knowledge” over the possibility.
It’s important to note that “possibility” in this epistemic sense does not necessarily align with whether something was a real possibility.