Help! I want to remove Windows EFI Boot Entry, but can’t
It would appear you have two files named EFI. I am not sure how there can be two, but neither appears to be a directory (folder). This may prevent the creation of a EFI folder which could prevent the installation of any UEFI booting operation systems which use the EFI partition to boot.

I suppose since the volume seems to be corrupted, I would just reformat the the volume. The commands are given below. The first command can be skipped, if the volume is not mounted.

diskutil unmount /dev/disk0s1
sudo newfs_msdos -F 32 -v EFI /dev/rdisk0s1


Of course, you should backup all important data before reformatting.