I would disagree with that too.
I would agree that "most people earning £80k" would not feel like they're in the top 1/20 of earners. I would disagree that "most people" would not feel that someone earning 3x the national average salary is not in the top 1/20 of earners.
5% is not 1%, which is not 0.1% you'd probably need to move decimal place again from there to start talking about millionaires.
Anyone who thinks that the top 5% (so ~2,300,000 people in the UK) are millionaires... is an idiot.
Pretty much anyone who doesn't know that IT professionals are amongst the highest paid in the UK (especially, someone working in IT) is getting on for being an idiot.
What he was saying, in essence, was "I don't want all that much, compared to the high earners (doctors, solicitors, dentists, pilots) I hang out with - (I dont hang out with nurses, secretaries, hygienists, stewardesses etc, let alone factory workers, teachers, zero-hour contractors or unemployed people etc).
It's the same attitude that leads someone like Theresa May to claim that anyone earning less than £30k is "unskilled"