On May 14th 2020 the DGN in Mexico published an extension in the official journal of the federation of the date that the new NOM 001-SCFI-2018 will entry into force. That means the NOM 001-SCFI-2018 will take effect on August 14, 2020.
With this new information we are able to continue certifying under the older version (1993).
This statement has been published in the official journal of the federation, you can see the screenshot of the notification as follows: