Saving Tomato Seed

While discussing with some people on the internet, I found out that that (supposedly) tomato seed companies collect and dry their seed by a fermentation method. I argued that it could not be good for the seed to soak them in water for several days (think how this might effect most seed, say bean or okra), but in the end had to admit that it must work if commercial producers use the method. I am trying some this way this year but am secretly doing it the way I know that works (take the seed out of the tomato, wash as much of the jelly surrounding the seed off as you can, then allow to air dry several days).
Here is a link that explains the process and gives some pictures that help.