EFI Partition on NitroPad NS50, can it be deleted?

I see an EFI partition on a NitroPad NS50 with Ubuntu installed through the OEM Factory Reset with the following ISO https://www.nitrokey.com/files/ci/nitropad/ubuntu-oem/ubuntu-22.04.1-nitropad_nitropc-oem-amd64.iso

Is the partition really needed since the OS is booted in BIOS mode?
Can it be deleted?
On a related note: Veeam Backup gives a warning about the system not being EFI, because of the EFI partition presence. (I can bypass it by using the volume level backup and excluding the EFI partition).