These pseudo-scientific sensational articles are just garbage, a kick for the moment to attrack gullibles, in fact a waste of time. Tabloid style.
Serious reporting would not scream out like this and then totally retract
in the middle of the article. Besides, the people that lived there were no 'Britons'. There wasn't even something like the British Isles because it was before the great deluge that lowered the region, broke it apart from the continent while the Scandinavian Mountains were rising higher.
Later the main land of nowadays England was conquered by Romans, by Normans, by Anglo-Saxons.
Speaking of Britons, who is Reuters? British?