I saw this on a favorite cycling forum, where I "redacted" some of the key details.
Spoke to a friend and reliable source, employee of a large pro team. His sentiments about the tweet is that basically everyone agrees with it and openly think that has organized doping going on to some extent and/or still has back channels to Schumi. Also, the common belief is aligned with what Voigt and TSP said in that if the UCI didn't give the license they would have their pants sued off by entities with very deep pockets so they had little choice. A final rumor is that some riders are using new peptides similar to those that were recently banned like GW-501516, a new type of growth hormone and IGF that aren't tested for yet, and various banned anabolics in suspension form during training camps so that the ultra short half-life times won't show up on test results. If the rider were to take the substance right after a ride the glow time would only be around 6-8hrs for a normal dose and thus out of the system by the morning when testers typically show up.
Okay, so this is all just someone's rumor, so take it for what it's worth.