Fortunately, we don't have to rely solely on his book, to realise the whole thing stinks. There is plenty of other stuff out there.
Of which whether Wiggins is or is not a liar seems a minor sideshow say the least. Far more important is that teams will always run to the letter of the law, not necessarily the spirit. That being the case, how the TUE regs work is far more important and is slightly being lost in all the noise about Wiggins and Sky.
We can't know the ins and outs of why Wiggins, or any rider, may have been prescribed a particular drug. I can find plenty of cycling related links about performance enhancing and doctors jumping on the bandwagon to say Triamcinolone should not have been prescribed, I can also find plenty of learned papers that suggest there may not be a perfomance benefit, or that prescription may be justified in various circumstances. I have no idea which is right, and I'm willing to bet most of those commenting, particularly the more rabid ones, have no real idea either.
What do know is that the circumstances of that prescription must have been examined by UCI / WADA representatives who must, as stated in UCI regs, examine that prescription to check that it is justified and that there is no potential performance increase; and we know that WADA must make a judgement about the perfomance benefits or otherwise of drugs they list. Whether it's Sky or not, as
@Marmion suggests teams in pretty much any sport will play to the letter of the law and will push the boundaries as much as possible to gain a competitive advantage.
The real issue seems to me that if there is to be a TUE system it must be regulated and run in a way that compels teams to behave in a way that upholds the spirit as well as the letter of the law. If Triamcinolone, or any other drug, has the clear performance benefits suggested, the question is why is it available under a TUE system and why assessors approve prescriptions for it, not just for Sky but for any team.