It sounds to me that "Foo Da Bic" is just someones quick and dirty description to avoid having to go into what "without the heavy k-ending" and "without the heavy c-undertone ending" and "with very light c-ending" means and that they got it reasonably close with that in mind.

Reality is that nobody will pronounce it right just from those descriptions anyway - Vietnamese isn't exactly a trivial language to pronounce for people who don't know the sounds already -, so they're just going for illustrating that it isn't what every English speaker first think it'll sounds like.