This is terrible advice. These are all very well known, well documented avoidance techniques that ultimately do more harm than good. What happens when you sing the first few sounds of a sentence and someone does notice? How is that going to affect you? Very badly. And the notion that you can’t stutter while singling is absolutely false. Slight accent change - ok so you meet a girl at the bar and do a slight accent change to get the ball rolling... and then what? That girl you met at the bar isn’t going to notice that you’re suddenly not British anymore? You’ve basically guaranteed that there will be no lasting connection with this person as you’ve started the whole thing off by deceiving them. Last second word switch - this is something everyone does if they’re able to do it. And it doesn’t make things better. Because when you consistently switch words, substituting what you wanted to say for what you can say, eventually you start to feel like a fraud. Not to mention it’s mentally exhausting and unmaintainable. If you want to offer people advice, don’t tell them things they already know and certainly don’t tell them things that do more harm than good. Better advice would be to learn to love yourself for who you are and live your life being unapologetically you.