From the mac@porting.openoffice.org mailing list, there seems to have been a bit of confusion with the title “OpenOffice.org for Mac (X11)”. It would appear that people are thinking the Mac OS 11 is what the download is for. In fact it just references the fact that the X11 windowing system.
It would appear that this increase in traffic has something to do with there no longer being information on the installation of X11 on the final download page.