Compelling reasons

Do the words “compelling reasons” in the above passage import a limitation on the powers of a Court hearing an appeal under Section 417 not applicable to a Court hearing appeals against conviction? If they do, then it is merely the old doctrine than appeals against dressed in a new garb, and the reasons for rejecting it as unsound are as powerful as those which found favour with he Privy Council in AIR 1934 PC 227 (2) and AIR 1945 PC 151.