The simple answer to the clickbait-grade article headline "question" is "No". First of all, the issue concerns one part in the B-2, not the whole plane. Second, the part in question is produced by a sub-contractor, not the USAF or Northrup-Grumman. Third, retaining the documentation for the part is the responsibility of the sub-contractor, not the USAF or Northrup-Grumman.
As the article eventually opines, the B-2 has been out of production long enough that the sub-contractor may have gone out of business and the whereabouts of its documentation unknown.
Believe it or not, development cycles and equipment life-cycles of military equipment are long enough that re-engineering parts of a product due to some key part being obsoleted is not unusual.