List AllowDeletion is missing in new CSOM version !
I am sorry if this duplicate or if I missed to read the documentation. I tried to toggle allow list deletion to true or false and couldn't find the property.
Thank you for your input. We have just released this as part of the November 2016 release of SharePoint Online CSOM NuGet packages.
See following for additional details – https://dev.office.com/blogs/new-sharepoint-csom-version-released-for-Office-365-november-2016.