with respects, either this is too technical or maybe it the grammer could be cleaned up as it's kind of nonsensical to me
So, the TB is installed in whonix-ws OK, then the rest of it I can't make sense of , In short , it seems to say , as a back up I can/must check for updates in the "About Tor Browser" pull down in the TB ? for each and every AppVM that I might use the TB in ?
tb-updater in Qubes TemplateVM
Tor Browser is installed by default in Whonix-Workstation in Qubes-Whonix, but not in Non-Qubes-Whonix. If the reader is interested in the reasons why, see here and here.
Beginning with Whonix 13, Qubes-Whonix-Workstation builds by default automatically run the Tor Browser Downloader by Whonix (tb-updater package) (update-torbrowser) following its initial installation within chroot. If the attempt to run the tb-updater package is unsuccessful, then it will fail closed by default, meaning the package itself will fail to install. As a consequence, this could lead to an error while building Whonix images from source code or when installing Whonix from the repository. This is undesirable behavior, but it has been decided to still install Tor Browser by default in Qubes-Whonix-Workstation. The only way to ensure Tor Browser is really installed by default is to also fail closed when necessary.
Beginning with Whonix 13, Qubes-Whonix-Workstation TemplateVMs by default automatically run update-torbrowser during upgrades of Tor Browser Downloader by Whonix (tb-updater package). If the update-torbrowser process fails, it will fail open by default. In this event, the user will be informed in the terminal that no new Tor Browser could be downloaded, but apt-get will terminate normally. This is necessary to implement the Qubes-Whonix feature ensuring up-to-date versions of Tor Browser in newly created AppVMs are inherited from updated TemplateVMs.
If a failure is experienced, the user can still update Tor Browser using Tor Browser Internal Updater or by manually downloading Tor Browser. This is a small inconvenience and not a matter of major concern.
Actions of the tp-updater package can be optionally configured by the user. -