Wait a minute. The samples were taken in the period July 21-25. Since he would lose his 2010 TDF title, the ban must begin then, mustn't it? You're right that he wasn't informed of the positive until August 24, which is just past the start date of the Vuelta, but if the ban were to begin then, they couldn't take either his TDF title or any other results he might have had between the giving of the samples and being informed of the positive.
From the WADA code:
Bert’s original period of ineligibility began around the end of September 2010, when he agreed to a provisional suspension. If the ban were to begin then, then it would not even be close to ending for the 2012 Vuelta.
But…
This is what I was thinking. But who knows?
It does appear that Bert served four and a half months of the suspension prior to the RFEC report, at which point he was free to resume racing. If he is banned for two years, per above, the earliest he could resume racing would be July 25 2012, which would be in plenty of time for the Vuelta. In this case, all his 2011 results, including the Giro, would be taken away. This seems to me the most favorable situation for him if he were banned for two years.
OTOH, I suppose it's possible that he could be allowed to keep the 2011 results, with the remaining time on his ban beginning when the CAS decision was announced. Valverde's case was handled something like that I believe. That seems to be early January 2012, which would mean he would be out the entire season 2012, and up until near the end of August 2013--so he would miss the Giro and TDF that year, too, and it would be very close whether he could start the Vuelta.
Given a choice, I assume Bert would much prefer to lose all 2011 results, and be able to return late next year, maybe for the Vuelta.