Incorrect. MOD Form 90 is military ID for active service which they are allowed to keep. The veteran ID is new.

The new card is one of three that are available to service leavers. Personnel leaving the armed forces are also able to keep their military IDs, known as the MOD Form 90, allowing them to maintain their emotional connection with their service. Additionally, veterans can access a range of discounts through the Defence Discount Service, the official MOD-endorsed service for the armed forces.

https://www.gov.uk/government/news/new-veterans-id-cards-rolled-out-to-service-leavers

In addition to one of the new ID cards, personnel leaving the armed forces are also able to keep their military IDs, known as the MOD Form 90, and veterans can access a range of discounts through the Defence Discount Service, the official MOD-endorsed service for the armed forces.

https://www.forces.net/news/veterans-be-formally-recognised-official-id-cards