The creation, alteration, or deletion of any computer data contained in any computer or computer network, which if done on a tangible document or instrument would constitute forgery under Article 1 (§ 18.2-168 et seq.) of Chapter 6 of this Title, will also be deemed to be forgery. The absence of a tangible writing directly created or altered by the offender shall not be a defense to any crime set forth in Article 1 (§ 18.2-168 et seq.) of Chapter 6 of this Title if a creation, alteration, or deletion of computer data was involved in lieu of a tangible document or instrument.