Update worked for me. The eink system seems to be stable after upgrading.
OneNote syncing does work, though the sign-in technique for syncing is super weird and not intuitive. Clicking on the OneNote portion of the pull down menu on the eink display brings up a Windows login screen for OneNote. Signing in here links the eink drawings with my OneNote account. It is not obvious where to click on the eink menus to initiate sign-in. I just got lucky.
Changes made to drawings in eink seem to promptly propagate to OneNote after syncing. However, deleting or renaming imported drawings from within OneNote does not seem to change them in the eink menu.
For example, I created a drawing and waited for it to show up in OneNote. I then changed the title in OneNote. No title change appeared in eink. Then I deleted the drawing in OneNote. It did not disappear from eink. However, subsequent resyncing DID NOT cause the eink drawing to reappear in OneNote UNTIL I made an additional change to that drawing in eink, and then it resynced in OneNote despite the previous delete.
This behavior is slightly weird and seems to indicate full bi-directional note management is not possible, but rather eink only pushes changes in one direction.
Eink notes import into "Quick Notes" in OneNote, and I do not see a way to change this default location.
The date stamp of drawings imported into OneNote appear in Mandrin characters (with an English title), and I can't change the date language.
Other than those quirks, it appears to work and is stable in my testing so far. Roughly implimented, but better than nothing. I did cringe a little bit in reading the permissions you have to grant the Eink SDK in order to access your OneNote account. Basically full write control. I'm just imaginging a poorly written update to this software inadvertently wiping out all notes everywhere. Hopefully this remains a nightmare only.
In the meantime, I will enjoy this update having purchased the laptop not expecting any functional upgrades ever.
To the lone programmer (or small group) developing this software, if you are reading this, thanks for throwing us a bone! Additional refinement of this software will pay tenfold dividends itoward how amazingly useful this laptop can be! Don't give up! Fight the reassignment to the Thinkpad development group and keep pushing forward!