the knowledge of the science of replacing eggs was in it's infancy in 1999. a lot can happen in 1 year (look at the recent cheese revolutions) let alone 16 years.
(also, there was far less of a vegan hive mind sharing tips and techniques back then. she didn't have isa, terry [and definitely not chloe] to learn from. she had to make do.)
But the book was published in 2012, not 1999. I don't think it was a reprint, was it? And even if it was, I'd imagine that much as Isa did in VWAV II, she could have updated it to rely less heavily on egg replacers if she wanted to.
I thought it was interested that in Tamisin's review she says that she was uncomfortable with the way that Doron puts down other vegan bakers (and I saw that in Cupcake Wars too). Maybe she just isn't that interested in being part of the vegan hivemind?