Only relevant to pensioners claiming means tested benefits.
For those only claiming State Pension where no yearly information submissions are required, and your only claim is made at the start of your pension entitlement age, it's not relevant.
It's also not relevant to those on means tested benefits that take all their pension out of their bank account every 4 weeks. If you pay cash for everything, there's not that much data on your monthly 'outgoings' for them to collect and examine.
But I'd be interested in knowing what means tested benefits you claim, as it seems to be of great concern to you ....... I hope you're not on the fiddle!