I'm not all too familiar with mass grave, but it does seem like a similar loophole to the win11 updates without TPM 2.0, in that it works but ms doesn't want it to, so you may run into the issue of your system bricking or ms holding your data hostage. Also as far as I can decipher ltsc only fixes the security issue, as far as I am aware the one drive push is still there regardless of version.
All in all, I believe that there are workarounds, but if ms is so keen on making it this hard to stay on win 10 I would rather just take the adjustment period to a Linux distro.