You're inventing new terms.
It's either a reimagining, or a story set in a parallel timeline, that diverged from the prime time line at some point, which they will explain later.
Vulcan life spans.
(I don't go into this forum much. Sorry if this has been brought up.)
Sure, Discovery may be 10 years before Kirk, but... What if Burnham's memories of the Shenzu are from 10 years after Archer?
Burnham is Human.