Don`nt know much about the Oera Linda Book, all I know is science has proven there was no world wide flood or that the black sea ever rapidly flooded. However around 2300 years ago there was a great tsunamis that hit New York.
As for vampyra, thinking more on that, the phrase used "even as vampyra do", may have been added in on any number of copying of the manuscript. I don't think it's a Frisian word, since none start with V unless it's being used as a 'u'. V is not even included in the Frisian dictionary, it's a borrowed word.
That's the thing, we just don't know how much or what has been added in at a later date and when copied again, it appears to be part of what should be there, written originally and doesn't fit.
"The agony and the irony, they're killing me" Flagpole Sitta - Harvey Danger
Around 2500 years ago, in ~ 500 b.C., some ancient European towns founded on river deltas underwent a sudden subsidence which brought them below the sea level. The most evident example is that of the city of Sybaris,(Calabria), which underwent a subsidence of about 6 m. The same thing happened at the same time (~ 500 b.C) to the city of Velia (Campania), which was buried under 4 m af alluvium. Still in 500 B.C. the city of Tartesso, Southern Spain, is said to have disappeared in a short time,Atlantis