I find that hard to believe, because, at least with my TS, the points system units are separate from the units the TS salespeople and the like have access to. They are separate divisions and the TS salespeople do not have legal access to the owned units, nor can the home company rent them out (unless the owner hasn't paid for so long his account gets suspended). If the guy on TV meant that people who get one of those "free weekends if you come in for a sales presentation" don't usually end up in the resort but are instead booked into a local motel, then, yes, of course they do that. However that has no impact on the points owners, because it's a different set of units.
But overbooking the
owner's units is rare, to the point where I don't think I've heard of it before. In our system, people only get moved if they're fully booked when sudden maintenance issues crop up -- or there's a hurricane and the resort is damaged.

Although I assume DVC is set up differently, or they wouldn't have been able to bump the owners for the PGA golfers as crisi mentioned.