Reading this story I've been operating on the presumption that the Night Sky and the Orange Sky tomes were part of a larger run of Devices produced by the Belkan Empire with the Orange being an earlier model.
The Night Tome (and I tend to headcanon that the more correct spelling would be "Knight") was to be the pinnacle crown of the development but when it was completed it went right buggy and the attempt was made to dispose of the other Tomes before they too were corrupted.
While successful in destroying the other tomes, the Orange Tome instead fell to Naruto's world. It also lacked some critical additions to its repair programs that the Night Tome was outfitted with and caused that Tome to go bonkers, so there is no danger of a "Book of Darkness" incident here.
Not much is known about the Tome of the Night Sky's origins, but there is
some information.
When it was first created, it functioned as a benign storage medium for magical spells.
However, at some point later, some unknown mages fucked with the Tome of the Night Sky in order to use it as a prison to seal away the Tome of the Purple Sky and its lord Yuri Eberwein. While they succeeded in this, turning both the Tome of the Purple Sky and Yuri herself into subroutines of the Book of the Night Sky, but in doing so they broke the Book's security protocols and also accidentally turned Yuri into a multi-part entity that would come to be known as Unbreakable Dark.
Unbreakable Dark claims to be the
actual reason why the Tome of the Night Sky was renamed the Book of Darkness; as after the mages fucked up the Tome it became the prison of Unbreakable Dark, and Unbreakable Dark claims that it was her rampaging energies that were the true cause of the Tome's security protocols going haywire. However in one of the movies it is revealed that after Yuri was sealed in the Book of Darkness, she actually took on the role of preventing NachtWal, the Book's corrupted Defense Program, from running rogue; as according to
this version of the story Yuri had been created by an archaeologist with 'full knowledge of Ancient Belka' as a Guardian System to control and restrain NachtWal.
Which of these two versions is the truth (or perhaps, both are) is unclear.
Incidentally, the reason why Yuri didn't show up during the Book of Darkness Incident is because the page containing her subroutine had somehow gotten removed from the Book and cast into the Dimensional Sea, where it crystallized, so by the time of the Book of Darkness Incident she was no longer in the Book and thus unable to restrain NachtWal.
All of that said, we can conclude from the existence of the Tome of the Purple Sky that multiple Tome of the X Sky Devices were indeed created. As such the Tome of the Orange Sky is 100% canon compliant.
e:
Okay, that statement makes me think that the Uzumaki had help from The Doctor Him\herself in their concealment plan
Or maybe it's the other way around; the Time Lords
did acquire the power of Regeneration from the Timeless Child rather than creating it themselves after all, perhaps they got their technology from the Uzumaki.