"Vandal only shows a 1/8" long tenon, so he is getting minimal long grain to long grain gluing. I doubt his method of construction of the candle slide joint was used on the original."
I looked up Norm's book, and as nearly as I can tell, all of the glue surface is cross-grain over a fairly wide slide, which one would expect to break fairly quickly with the changing of the seasons.
The only picture of an original that I could find on-line was a Massachusetts/Rhode Island rectangular Queen Anne tea table in the Chipstone collection that has a most unusual arrangement - the candle slide is nearly the full width of the end aprons. I've never figured out how to link to a specific photograph on that site (just copying the link doesn't do it), but the accession number is 1968.4. It also looks like CHipstone's renovated their website, and the link to the U of Wisconsin digital arts library is about 2/3rds of the way down in the "about chipstone" page.
Interestingly, the high-resolution picture makes it look strongly like the slide is through-tenoned into the slide cap on this table. One implication if this is true is that either the slide was made of the primary wood (mahogany), or the maker dyed the wood, perhaps with alkanet root. It's hard to conceive of an 18th century customer that would've accepted a bright through-tenon of white pine on such a table.
The underside of the table is also hard to interpret - there's a V shaped notch all the way across the width near the center of the length. I'm not sure what's in this photograph are the undersides of the slides, or whether there's two boards that are the width of the table tacked to the undersides as the candle slide support. One interesting thing about this support structure is that if you look carefully, there's what strongly looks like planer snipe on the right side support board. Obviously, that would mean a later repair if that's what that bright/dark line is.