Why No Historical Accounts of Three Coastal Egyptian Cities Slumped Into the Sea in 8th Century by Liquefaction?

The ancient coastal Egyptian cities named Canopus, Menouthis, and Herakleion-Thonis are said by the uniformitarians to have slid and sunk (by liquefaction) into the Mediterranean (Aboukir Bay) in the 8th century a. d., but don’t you suppose the sudden disappearance of three major port cities would have been noted and recorded by at least a few historians at the time, the disappearance of those cities thus legendary? So considering Canopus and Thonis-Heraklion were named for historic persons who lived after the Ice Age had ended, and that Classical Greek and later Christian historians documented the existence of those cities on the Aboukir Peninsula, it seems the extensive ruins submerged in Aboukir Bay were built my Mneseus (a son of Sidon/Poseidon) and grandson of Canaan during the Ice Age, the Menouthis noted by the Classical Greek and later Christian historians on Aboukir Peninsula between Canopus and Thonis-Herakleion having been named in remembrance of Ice Age Menouthis.