On page 74 you write

Note that the value returned is the value in the sequence, which would act
as a truthy value if this was used as a conditional test.

I assume, that you refer to the general use of some, but then the return value of some is not a value in the sequence but rather the first truthy return value of the given predicate. I think that your statement is only correct if the identity function is used as predicate or if the predicate returns the element itself.

An alternative statement would be

Note that some returns the first truthy value produced by applying the predicate to the sequence elements.
This value can be used directly as a truthy value in a conditional.