Recent Dell OS Recovery locked GRUB out of Inspiron 7591

Today the most recent Dell OS Recovery software update locked me out of my Dell Inspiron 7591 service tag  without warning.

When booting any Linux (Secure Boot is off) to try to fix it, /dev/nvme0n1 (the internal SSD) is no longer present, and no other partitions exist anywhere (cat /proc/partitions).

But in Windows I can see the Linux partitions are still on the SSD.

I am hoping someone in the Dell community sees this and knows who to tell.

Given that tech support will only parrot "Linux did not come installed on your laptop", I'm not interested in talking to them.

So I'm probably going to have to pull the internal M.2 SSD back out, boot a Live DVD, slap my LUKS 1TB USB drive back in, burn the dd image back to the M.2 SSD, reinstall, and hope and pray that I can avoid ever updating the Dell OS Recovery software.

I tried switching internal SSD drive in BIOS to/from RAID/AHCI without results.

This is highly problematic for me, as I have 2 chapters to read tonight for grad school and I have 10 years of email and many pictures and memories in those partitions that I need to back up.

None of the other usual tricks have fixed the problem.  And now I can't develop my web page (I use a public_html rsync concept) or migrate email (Thunderbird for Linux and Windows store files differently) or help with troubleshooting the Linux kernel in OpenSUSE LEAP 15.2 (we were working on isolating a memory leak).