i think there are two different meanings of truth here, and it sounds like one of them might be referring to aletheia. from the wikipedia page:

Heidegger gave an etymological analysis of aletheia and drew out an understanding of the term as "unconcealedness".[6] Thus, aletheia is distinct from conceptions of truth understood as statements which accurately describe a state of affairs (correspondence), or statements which fit properly into a system taken as a whole (coherence). Instead, Heidegger focused on the elucidation of how an ontological "world" is disclosed, or opened up, in which things are made intelligible for human beings in the first place, as part of a holistically structured background of meaning.

edit: just want to say that i agree with the message, and i think it's true that things don't have to actually happened in order to be true in some sense. i think the term aletheia can be helpful for making the distinction and wanted to share it for that reason