You still don't get it, and it's obvious you're choosing not to get it.
If Wiggins has asthma or allergies that still doesn't make his triamcinolone use legitimate. The standard asthma and allergy drugs (inhaled salbutamol in normal doses, inhaled corticosteroids, nasal spray corticosteroids, antihistamines) don't even need TUEs these days, because a) they have minimal performance-enhancing effect and b) lots of people legitimately need those drugs (first couple of links I dug up like
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2764772/ and
http://www.globalasthmareport.org/burden/burden.php suggest asthma prevalence of low to medium double figure % in most western countries) so it's an administrative pain for ADAs to issue TUEs for them. Most of them used to need TUEs though (basically everything except antihistamines), so it's not surprising that Wiggins was given TUEs for them back when he was riding for French teams (with a GT record of 123rd, 121st, DNF, 134th for the record).
In contrast, slow-release injected triamcinolone is not recommended for asthma and allergies, even though it effectively treats symptoms, due to its extreme and often dangerous potential side effects. It is however a fantastic drug for doping, because it causes weight loss even among fit people who have little fat to start with, strongly reduces inflammation and pain, and increases energy levels. It has a long history of doping use in cycling, and doping riders have a long history of using whatever excuse they can to get a TUE for it (and several have admitted that and testified to its effects - for David Millar called it the strongest drug he used in his career).
Let's say none of the above was true, and Wiggins was one of the sickest men of the peloton in 2012, struggling with allergy issues even after being treated with the allowed in-competition inhaled salbutamol, inhaled corticosteroids, nasal spray corticosteroids, and antihistamines, and even if he was treated OOC with things like oral prednisolone (which is a strong drug only prescribed in short courses and when you're too sick to walk up a set of stairs or get on a bike, but is a recognised standard treatment at least, unlike triamcinolone, which is like using a rocket launcher to swat a fly).
If so he'd barely have made it to the end of stage 1 of a race in 2012, when in fact his pre-Tour record was:
(Feb) Volta ao Algarve: 3rd overall, 1st stage 5
(Mar) Paris–Nice: 1st overall, 1st points jersey, 1st stage 8
(Apr) Tour de Romandie: 1st overall, 1st stage 1, 1st stage 5
(Jun) Critérium du Dauphiné: 1st overall, 1st stage 4
If you still don't get it after than then I can't help you.