I got NOA2'd back in April 2020. I didn't hear anything from NVC until this April with a Termination letter/email basically asking if we're still interested because we haven't done anything they told us to. I replied back yes and we didn't do anything because you never contacted us. The contacted back and said they'd forward once Bogota resumes visa services. The case was finally forwarded to Bogota on June 8th '21. I assume they're just sending out whatever form letters they think fit to clear the backlog.