I was just about to say; the RSS feed definitely doesn't follow that rule, and I use the feed for updates much more than visiting the main page.
I believe that the RSS feed does follow that rule. It's just that Guinness often goes through and adds the "V" or removes a space or capitalizes a "v". There have also been some apps that have been changed to a beta release and then changed back. I just scanned through the RSS feed back to August 3rd, and I don't see any instances of multiple updates with the same version number (except one that was changed something like "Vv1.2 to "V1.2").
I think it seems like it must be the other way because there are quite a few apps on this accelerated release schedule (XMediaRecode, Stinger, Q-Dir, DesktopOK, System Explorer and Simple Port Forwarding come to mind).
The number of updates has overwhelmed me as well. I've considered unsubscribing from the main RSS feed, since I have a backlog of about 50 updates or apps that I want to check out, and I don't have that much free time these days. I think I spend 10-20 minutes per week clicking the "mark as read" button in FeedDemon just for TPFC.
I also wish I had an RSS reader that could collapse all of the replies to a thread on the forum into a single view, like Gmail does with email, which would cut the number of unread items by at least a third most days.