Yes, and it will continue to carry forward until he does have self-employed income again. It's a benefit that is only deductible in the future year he deducts actual home office expenses again.
Per the IRS:
If your business expenses related to the home are greater than the current year's limit, you can carry over the excess to the next year in which you use actual expenses. They are subject to the deduction limit for that year, whether or not you live in the same home during that year.
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