I've done this course. I basically spent an age digging up studies debunking their views & said things like "...although it is commonly believed that this is the case, the actual research points more towards this (& bunged in the relevant research)...". I would only suggest that if a person was not so concerned with the qualification though!
This dietary advice is a common theme in all personal training courses I believe, as I've yet to hear of a good one!
Luckily my examiner(s?) were ok & actually sent a note along saying how although they'd read many papers & much research they'd not come across my research before & I got 90-odd % (apparently some of my answers were illegible (curse of being left handed I suppose).
I'd suggest you're probably more likely to pass if you 'play the game' & the alternative means spending a LONG time digging through pubmed, emailing researchers, vegan nutritonists & doctors as well as making sure you've REALLY covered all your bases...& even then, if you get the wrong examiner, you'd still fail because you didn't give the text book answers (it may also have helped me that I run vegan bodybuilding, & I'm one of the few UK ISSA trainers? Anyway, I won't be doing ANYTHING nutrition related with them again, too much hard work having to fight the system.
Oh yea & one of my final question was "How would you plan a vegan strength athletes diet". I kid you not!
If you want to chat a bit more email me firstname.lastname@example.org