Load of bollocks. How do you prove it? Just look at the technology and sociological advances made in the last 1,000 years. Look at the equivalent from c1080. The Doomsday Book, this was written in Medieval Latin and was highly abbreviated and included some vernacular native terms without Latin equivalents. So, it was written in ink on velum? and we still cannot read/understand all of it.
How many words and abbreviations in regular use in various Navies (vernacular native terms seems quite apt :-) ) will be understood in 100 years time let let alone 1,000 years.
Anyone paying good money for 1,000 year archives needs to invest in quality paper, ink and people who have legible handwriting! Oh, and add a dictionary to the list of things to be transcribed :-)