Al,
Yeah we know all that and have tried all the techniques with this stuff, including clear polyester, but as she said this is her way of doing it, you're not going to tell her anything she doesn't already know, so this is how she does it. She's been doing this for about 6 or 7 years this way and has never had a problem with a part chipping or cracking, or being weak.
As for stuffing matt into detail areas, we've gone that route too and you can't get matt into the super small kit part detail of a mold, the only way to do it is allow the resin to run into it, we're talking like 1/16" of layer of epoxy, then use 3 layers of 10oz fabric for something like this, trust me it's strong.
When she started this there wasn't really any help on laying up fiberglass into a rubber mold, so we tried all of it until she found a technique that works best, that's why she decided to make the video hoping it would help someone else out.