
Explanation

Box 1:
Office 365 ProPlus feature updates will be installed twice a year in March and September.
The Channel element in the configuration file is set to 'Targeted'. This means Semi-Annual Targeted.
To help your organization prepare for a Semi-Annual Channel release, Microsoft provides Semi-Annual Channel (Targeted). The primary purpose of this update channel is to give pilot users and application compatibility testers in your organization a chance to work with the upcoming Semi-Annual Channel release Box 2:
Microsoft Office 365 ProPlus applications must be installed from a network share only.
The AllowCDNFallback value is currently set to true. The purpose of this setting is to enable Office 365 to be downloaded from Microsoft's Content Delivery Network if the network share is unavailable. The AllowCDNFallback value should be set to false to meet the technical requirement.
Reference:
https://docs.microsoft.com/en-us/deployoffice/configuration-options-for-the-office-2016-deployment-tool#updat
https://docs.microsoft.com/en-us/deployoffice/overview-of-update-channels-for-office-365-proplus