I think he’s scaremongering and I’m nor sure I understand what his motive is. His previous video was called They're Taxing Your State Pension Now. State Pension has always been taxable.
HMRC are not going to come after you for tax arrears unless they have assessed you for that tax in the first place. They will always find other ways to collect unpaid tax first e.g. an adjustment to the tax code before sending the bailiffs out for tiny sums.
You can chose how to pay tax arrears on pensions either through a coding adjustment if you have a private pension or by direct payment.
Unless there are grounds of appeal. e.g. if that assessment is incorrect, then you have to pay. Pensioners are no different to anyone else. If your income exceeds £12,570, you have to pay income tax.
HMRC does have mobile advisers:
Where appropriate, our mobile advisers can meet customers in their home, or somewhere convenient nearby, to talk through the issues in a friendly and supportive way.
www.gov.uk/government/publications/hmrc-issue-briefing-support-for-customers-who-need-extra-help/hmrc-issue-briefing-support-for-customers-who-need-extra-help
Last time this came up was in a discussion between Rachel Reeves and Martin Lewis:
Martin Lewis: "I'm going to start, if that's okay, with Rebecca, who says: 'Does my 85-year-old father who's living with dementia now have to complete a tax return as his State Pension will take him over the personal allowance?'."
The Chancellor Rachel Reeves: "So if you just have a State Pension, you don't have any other pension, we are not going to make you fill in a tax return."
Martin: "Of any type?"
The Chancellor: "Yes. And so I make that commitment for this Parliament. You're right, 2027 looks like the time that it will cross over. We are working on a solution, as we speak, to ensure that we're not going after tiny amounts of money."
Martin: "But people will have to pay the tax. They just won't have to do a return? Or will they not have to pay the tax?"
The Chancellor: "In this Parliament, they won't have to pay the tax."
Martin: "Okay."
The Chancellor: "You know, further out, I'm not about to make any commitments on that. But we're just looking at a simple workaround at the moment."
www.moneysavingexpert.com/news/2025/11/martin-lewis-chancellor-state-pension-income-tax/
Where would the threshold be?
Paul Lewis reported that at May 2025 758,363 on old State Pension and 64,603 on new State Pension had weekly State Pension above £300. Many have State Pension over £400 a week. They may have no other income. Reeves is unlikely to say that pensioners with incomes in excess of £15,000 from SP only won't have to pay tax while everyone else, other pensioners and working age people are bound by the £12,570 threshold.