Bear in mind that that 99 lbs is for a single joint with pressure being applied in the manner of a first class lever in Mr. Wandel's experiment. You will have multiple pocket holes in a given construction. Let's look at your table example. Most of that pressure is being distributed through the legs and into the floor, say you have four legs and four boards making up the frame that the tabletop attaches to. it's also being used in conjunction with wood glue (e.g. titebond), so you're not just looking at the strength of the screws but the glue as well.
Even disregarding the fact that you're going to glue your pocket holes, that pressure is distributed over at a minimum of two joints and much of the pressure from someone leaning on the table is going into the legs themselves, not into the class one lever directly applied to the joint like Mr. Wandel used for his experiment.
A pocket hole joint is great for face frames as rob mentioned. A friend of mine used a kreg jig to build his desk and it has not fallen to pieces around him. I probably wouldn't use it for a kitchen table as the sole joint, but I wouldn't be opposed to using them to help clamp mortise and tenon joints.
Frankly, I think Mr. Wandels' experiment is misleading in that it shows that a single joint is stronger, but the impression it gives is that you shouldn't use pocket holes because they're weak, and that simply isn't the case. I am curious to know why his experiment disagrees with Kreg's claims from "independent testing." Kreg claims that a pocket hole joint can sustain more shear load than a mortise and tenon joint. This may be true, since Wandel's test wasn't for a shear load. It might be interesting to see how that experiment was done.
Mostly I think there is opposition to pocket hole joinery because it isn't "classy." Woodworkers like to think of themselves as rustic traditionalists, carrying on a craft passed on for generations. Pocket holes may seem too much like a crutch, or being too "modern," but they're frankly plenty strong for quite a few situations, including light tables and desks.