What am I missing here?

A Notice CP81 from IRS in Austin dated May 24, 2021, says:

“We haven’t received your tax return for the year shown above. The statue (yes, that’s what it says, not statute) of limitations for claiming a refund for the tax year shown above is set to expire. As a result you are at risk of losing the right to a potential refund of your credits and/or payments shown above.”

The credit on account is $145.  The tax year is 2017.  

No, the taxpayer does not live in Texas or other disaster area.