We have a CDL that originated in a prior year and was to have matured in Feb 2021. The note was modified and extended (no new note) at maturity to push the maturity date to August 2021. Can we report it as a CDL for 2021. Thanks!

Sounds like a "renewal" to me - the underlying note's maturity was extended. All originations, renewals, and refinanced loans (including CD loans) are qualified to be recognized subject to the once-per-year rule.