The rest of the advice is common sense advice to any suspect if you wish to assist them escape justice (no doubt rapists will also welcome the caring advice of Fitwatch that they can use should the need arise ...). But the suggestion to say "It's not me", apparently in the context of giving evidence to the Court as it mentions a judge maybe not recognising you even if you do recognise yourself, would amount to perjury and I'm not sure that I would characterise perjuring yourself as "good" advice (nor would I expect most criminal lawyers to do so).
Saying nothing (which is very different from lying) is sound advice in relation to the time of arrest, in interview and even, subject to legal advice, in Court.