Disk Size from make-disk-image is not respecting diskSize or additionalDiskSize variables

I run build with this command many times with the intention of building a 100GB disk image, however it only creates a 6.5 gb.
The command:

nixos-rebuild build-image --flake .#myvm --image-variant qemu

please take a look at my flake and tell me why its not building to the expected size