Truth conditions of a sentence do not necessarily reflect current reality.
To illustrate with an example: suppose that, in a particular truth theory[2] which is a theory of truth where truth is somehow made acceptable despite semantic terms as close as possible, the word "Nixon" refers to Richard M. Nixon, and "is alive" is associated with the set of currently living things.
In semantics, the truth condition of a sentence is almost universally considered distinct from its meaning.
Additionally, there are many sentences that are understood although their truth condition is uncertain.
One popular argument for this view is that some sentences are necessarily true—that is, they are true whatever happens to obtain.