Here is exactly what happens, so there are no surprises:
Your sign-in is deleted permanently. Sessions are revoked everywhere, and this cannot be undone.
Your company's records stay. Calls, customers, jobs and invoices belong to the business workspace and remain for the people still working in it. Your name comes off them.
This deletes your personal account only. Closing a whole business workspace is a separate request to support, because it destroys company records other people may need.
Account deleted
Your sign-in is gone and every session has been signed out. Your company's records remain with the workspace.
If this was a mistake, the account cannot be recovered; whoever runs the workspace can invite you again with a fresh one.