Debian10 , RAID0 : did it changed since Debian9?

I’m installing a pretty big backup server with a Debian10 installed and running on its NVMe disks. It also has 4x6TB SATA hard drives, and I’m trying to set these up as a RAID0 array. I’m usually following the explanations here: https://www.digitalocean.com/community/tutorials/how-to-create-raid-arrays-with-mdadm-on-debian-9 which always worked for me in Debian9. The symptom is that when I…

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