Issue in question is older account from pre kyc days where funds are still on there but unable to withdrawal. IF that person KYCs as US will they be able to withdrawal? If account closed not a problem but will funds be able to withdrawal. It sounds like yes?
After reading the post above, I checked the terms of service but I think it's difficult to say whether they'll just put your account in withdrawal mode only, or lock it completely since the U.S doesn't fall under the category of sanctioned countries:
3. Sanctions:
If you live in a comprehensively sanctioned country or territory, we will have to lock your account and initiate off-boarding. Most of the time, you simply won’t be able to sign up, or pass KYC. But new rules do come up, especially given the ever changing geopolitical environment.
Please understand, we don’t make sanction laws, but we must follow them. There isn’t any choice here. In most instances, your account will be put into withdrawal only mode, and you must withdraw your assets. For users that are affected by these restrictions, we will give notice in advance to allow them to take any necessary action.
4. Restricted Countries
-snip-
For example, if you traveled to the US and accessed your account, our system will lock your account and ask you to verify that you are not an US citizen and do not live in the US. This is to ensure no US citizens or residences are using Binance.com (they may instead use Binance.US).
-snip-
Have you tried to reach out to the support team and ask them directly?