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I've had a look at this one. It was unfortunate that he got his initial rating scoring 1/9 using iteration in an unsuitable round robin, just about the best way to get an unreliable result. Even so, until the end of last year there was no reason to think he was worth any more than 1600, so this is a remarkable result.
Looking at the results; lost to the two strong players and got something against everybody else; what makes that a good result the 2100-2200 may have played badly to lose to him; at 16 years old beating 2200s isn’t shocking; like Nick said just had a under valued rating
Presumably his opponents are satisfied that it was legitimate.
If you search for the name of the player removed from last year's 4NCL Telford minor tournament, there's evidence on a chessbase site using engine matching. His 120 standard opponents usually manage about 20%, whereas his matching rate is 70% plus. It's still not generally known what was his method, or how the Telford organisers and arbiters detected it.