Most likely "bewitching" the UCI won't be a top level decision but it's easy to see how sportswashing fits in a general approach to make UAE more attractive for investors, turism and people from democratic states in general. They know that their dependency on petro dollars is fragile and as an authoritarian state they can play the long game funding whatever fits the bigger picture.
The partnerships between the UCI and UAE goes beyond the UAE team so there are multiple ways in how influence happens that makes it much more difficult for the UCI to act independently. For example, I can imagine that a Lazkano case might never happen with top riders at UAE simply because the UCI knows the negative impact could be huge (not just for the sport, also for the UCI). They could even decide to actively work with UAE to give explanations to the anomalies to ensure that any future review of the data does not result in red flags.
In the mean time, the UCI gives other teams clear warnings that they take things seriously. Even if Red Bull has concerns, having one of their own riders suspended gives them less authority to act. The UCI can say: "We do our job. Do yours too and don't sign cheaters."