Retroactive VA Disability Tax Implications?

I recently received a retroactive VA determination.  This is cut from page 18 from IRS pub 525.  It looks like since they withheld a large amount of my disability compensation they are allowing us to reduce my previously filed retirement income that was taxed?

Any advice is greatly appreciated.

Pub 525:
Retroactive VA determination. If you retire from the U.S. Armed Forces based on years of service and are later given a retroactive service-connected disability rating by the VA, your retirement pay for the retroactive period is excluded from income up to the amount of VA disability benefits you would have been entitled to receive. You can claim a refund of any tax paid on the excludable amount (subject to the statute of limitations) by filing an amended return on Form 1040-X for each previous year during the retroactive period. You must include with each Form 1040-X a copy of the official VA determination letter granting the retroactive benefit. The letter must show the amount withheld and the effective date of the benefit. If you receive a lump-sum disability severance payment and are later awarded VA disability benefits, exclude 100% of the severance benefit from your income. However, you must include in your income any lump-sum readjustment or other nondisability severance payment you received on release from active duty, even if you're later given a retroactive disability rating by the VA. Special statute of limitations. In most cases, under the statute of limitations a claim for credit or refund must be filed within 3 years from the time a return was filed. However, if you receive a retroactive service-connected disability rating determination, the statute of limitations is extended by a 1-year period beginning on the date of the determination. This 1-year extended period applies to claims for credit or refund filed after June 17, 2008, and doesn't apply to any tax year that began more than 5 years before the date of the determination.