It is a time of despair.
Luke Skywalker, striving
to reforge the legendary
Jedi Order, has vanished.

There is nothing here that contradicts canon. For the audience and galaxy at large, all we know is that Luke was striving to bring back the Jedi right before he vanished. We aren’t supposed to know anything beyond that. If you want to be nitpicky about it, just insert the word “while” before striving in your mind while reading.

EDIT: I suppose “destined” would be a suitable replacement for “striving”. But I don’t think it’s worth changing if Nev is satisfied with how it was originally.

Ultimately, DZ is right, we should be focusing our efforts on this last paragraph which is particularly troublesome.