As this is under "Ask a Gran" I assumed the OP wanted an answer so I copied the opening paragraph over to ChatGPT, asked if it was true and if we know any more details. This was the answer:
No — the forum post appears to be mixing up two completely different pension issues.
I’ve checked the current reporting around Andy Burnham and the State Pension, including the specific “before April 1950” date. I can’t find evidence that Burnham has proposed giving pensioners born before 6 April 1950 a lower triple-lock increase than those born afterwards.
In fact, the current evidence points the other way. Burnham has recently reaffirmed his commitment to retaining the State Pension triple lock. In July he answered questions on the subject and said the Labour manifesto commitment remained in place.
There is, however, a live debate about whether the triple lock is affordable in the long term. Advisers and pension-policy organisations have been urging the next government to look at changing it or replacing it, because State Pension spending is rising rapidly. Sky News reported in July that some of Burnham's advisers are hostile to the triple lock and regard it as unsustainable. But that is quite different from saying: "people born before April 1950 will get a smaller annual increase." I haven't found a credible source saying Burnham has proposed that.
So where does 6 April 1950 come from? This is the important bit. 6 April 1950 is a very significant date in the history of the State Pension — but not because of the triple lock. Under the old rules, a woman born on or before 5 April 1950 reached State Pension age at 60. Women born from 6 April 1950 onwards were caught by the gradual increases in women's State Pension age.
That is the issue which eventually produced the WASPI campaign. Women born in the 1950s had their State Pension age increased, in some cases substantially, and many argued that they weren't given adequate notice. The PHSO subsequently found maladministration concerning the information provided to affected women, although the government decided against compensation. So when you see “born before April 1950”, alarm bells should actually ring for State Pension age/WASPI, rather than triple-lock uprating.
What about the old State Pension versus the new State Pension? There is another complication which may have helped create the confusion. The State Pension system changed in April 2016. People who reached State Pension age before then generally receive the basic State Pension (plus any additional pension entitlement), whereas people reaching pension age later are generally under the new State Pension system.
Both the basic State Pension and the new State Pension are subject to the triple lock.
But the amount someone receives isn't necessarily the same, because it depends on their National Insurance record and which pension arrangements they fall under. That's not the same thing as applying a different triple-lock percentage according to someone's date of birth.
And the supermarket argument? The forum poster is making a perfectly understandable point about the cost of living, but ,If the government said:
pensioner A gets a 5% State Pension increase because they were born after 6 April 1950;
pensioner B gets only 3% because they were born before that date,
that would indeed be a new and quite extraordinary policy, and I can find no evidence that Burnham has announced such a scheme.
What is happening is that there is increasing pressure on Burnham to address the cost of the triple lock. The Institute for Fiscal Studies and other pension experts have been questioning whether the current arrangement is sustainable in the long term.
So I would rate the forum claim “misleading/incorrect as written” rather than a genuine announcement by Burnham.
One thing is worth keeping an eye on, though: Burnham has committed to the triple lock as things stand, but the longer-term debate about changing it is very real.