Hi Jeremy,
Thanks for clarifying the context. MongoDB University On-Demand access is a separate offering which provides access to courses outside of the scheduled sessions. On-Demand access is only available with an activation code which will have an associated expiry date. Typically this is provided as part of a support subscription or special offer.
It sounds like you received On-Demand access as a bonus for attending MongoDB World last year. Unfortunately that offer will have an end date, but there will be future opportunities to earn access.
The schedule for general course offerings has been expanded from March, 2020 (as per the announcement you are commenting on), so access to all course materials is now available upon enrolment and you have two months to complete a course without any weekly deadlines.
Regards,
Stennie