I like how London "gangsters" like to evoke Tyson's name from time to time...
Like they try to make themselves bigger than life, by defeating a foe who had more money than they ever had, and far more name recognition than they ever had.
If you read the article there was no claim by him that he "beat up tyson", just BS journalism, sensationalised further by the OP lol.
"He pondered whether his ‘street credibility’ stemmed from his friendship with boxer Mike Tyson, with whom he shares a love of pigeons.
There was even a rumour that he had once got the better of the former world heavyweight champion in a friendly fight"
from what is written it seems he tries his best to avoid public notoriety, hence him trying to sue a newspaper for slander for claiming he was involved in crime.