From gov.uk
£150 Disability Cost of Living Payment
Around six million people across the UK who receive the following disability benefits will receive a one-off payment of £150 from September:
Disability Living Allowance
Personal Independence Payment
Attendance Allowance
Scottish Disability Benefits
Armed Forces Independence Payment
Constant Attendance Allowance
War Pension Mobility Supplement
We know people with disabilities may face a wide range of additional costs, such as specialist equipment, specialist food, and increased transport costs, and this payment will help with these costs as they are likely to have increased. Claimants must received a payment (or later receive a payment) of, one of these qualifying benefits for as of 25th May 2022 to get the payment.
For the many disability benefit recipients who receive means tested benefits, this £150 will come on top of the £650 they will receive separately.
These payments will be exempt from tax, will not count towards the benefit cap, and will not have any impact on existing benefit awards.
The government will make these payments directly to eligible people across the UK.
It is pretty clear to me that the £150 is for all who are on those disability benefits, not just those also getting means-tested ones.