Yes, it sounds like they have received your amended return, but have not processed the amended return.
Since you did receive a letter, check your letter if there is an address you can respond to. Also this link will help you interpret the notice you received.
https://ttlc.intuit.com/community/irs/help/i-got-a-letter-or-notice-from-the-irs/00/27100
I hope you find this information useful!
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