Lost Internet Data can be reconstructed

Technology Review reported that about 11% of online information is lost within a year with the figure rising to 27% within two years. The report got people worried of important historical information lost and so Internet archaeologists have come up with tools to reconstruct the lost information. According the archaeologists, it is possible to regain about 70% of lost information 40% of the time.

My question is, if recent lost Internet data can only be retrieved to 70% accuracy and only 40% of the time, how trustworthy is the reconstructed information from sources thousands of years ago?

Computer scientists have developed a technique for reconstructing missing web resources from the context in which they appeared, just like archaeologists in the physical world