This could provide some insight into what the peloton is up to these days. A diuretic is used to **** out a drug from the system as rapidly as possible. You would definitely not want to take it if you were blood transfusing, because all that water loss raises your HT at a time when you want to reduce it by increasing blood volume. So if he was blood doping he was taking EPO only.
Though personally, if I had been in the peloton and seen what happened to Hoogie, I wouldn't need a drug to **** copiously.
An optimistic interpretation of this is that the passport--and possibly even the DEHP test--has riders a little wary of blood transfusing, and sticking to micro-dosing EPO. Not that I would expect riders to be transfusing in the middle of the first week, though. So maybe he was just trying to avoid a positive for some steroid. The more I think about this, though, the stranger it seems, getting busted during the first week. This is the one part of the TDF I would think riders would be least dependent on chemical help. It's more about nerve and bike-handling than strength and endurance.
****, rhymes with kiss