To make sense of the build checking feature, it is necessary for aTbRef's author to remember to upload a ZIP of the current aTbRef's TBX. Although saving the TBX before full HTML output remains a manual task, the 'Zipper' note uses as its export template a runCommand() action to use a command line to zip the current TBX and place it in the root of the aTbRef export folder ready for FTP upload; nothing is actually exported in terms of HTML for the Zipper note.
As the working directory for CLs called from Tinderbox is '/' (i.e. volume root) it is necessary to encode the path to from there to the TBX: it is in $MyString for the Zipper note.
Unless anyone shares the same path on their Mac for storing their local aTbRef TBX this mechanism is unlikely to affect users wishing to make local HTML exports. At worst you will acquire an extra zipped copy of the TBX.