Backup copy To S3 storage, GFS and immutability

Hello,
We are going to set up a backup copy of a vm on a compatible S3 storage, and we will apply a GFS policy.
Immutability is activated for 7 days on the object storage.
Can you confirm this information below? Do you have a veeam article that explains this?

The immutability of GFS backups is not based on the immutability period defined in the Object Storage Repository, but on the retention period of the GFS backup point (e.g. Annual with a retention period of 7 years will have immutability defined for 7 years, so it won't be deletable for 7 years).