No, unfortunately, that's him. I turn on "Optional Diagnostic Data," close "Options," open it again, and the "Optional Diagnostic Data" switch is turned off again. I googled it and it says on the internet that you need to enable "Improving handwriting". Maybe that's not true, but then I have no idea why the switch is turned off.
No, you do not have to have the inking enabled. Check the following two registry locations:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\DataCollection, if there is an AllowTelemetry entry here, be sure it is set to 3 (I believe you indicated it is already)
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\DataCollection if there is an AllowTelemetry entry here, delete it.
-Eddie