No, this is unrelated to that old report that was invalid anyhow. I was able to reproduce this with mdadm --create -e 1.0 -n 2 -l 1 /dev/md0 /dev/sda /dev/sdb, then going through the install, it tried to install to a partition on the array. Interestingly, when I omit the -e 1.0, it tries to install to /dev/sda, as it should, but this fails since the default 1.2 metadata format does not leave room for grub.
No, this is unrelated to that old report that was invalid anyhow. I was able to reproduce this with mdadm --create -e 1.0 -n 2 -l 1 /dev/md0 /dev/sda /dev/sdb, then going through the install, it tried to install to a partition on the array. Interestingly, when I omit the -e 1.0, it tries to install to /dev/sda, as it should, but this fails since the default 1.2 metadata format does not leave room for grub.