The stewards’ report says:
“The rider, the BHA Veterinary Officer and the Racecourse Veterinary Surgeon were interviewed. Loughnane was suspended for 21 days for improper riding in that in riding his mount back, he had acted against the instructions of the Veterinary Surgeon.”
A face value reading of this gives the impression that Loughnane ignored a clear instruction given by the vet, in which case 21 days wouldn’t seem harsh to me.
However, whether the report gives the full picture of what happened is another matter.