It's not evidence that they did, but it's evidence supporting the claim they would. This isn't a court of law, I'm allowed to use "they've done <shady shit> before" to inform my prior for "they're doing <different shady shit> now".

They're all about things way shadier then battery-level-based pricing.

They are proof that Uber has already done worse things that involve similar capabilities and rewards. In other words, it is the kind of organization that is much more likely to have done battery-panic pricing, and that should affect how credible you think the accusation is.

Compare the vibe of: "So what if he was convicted of home-invasion robbery, that doesn't prove he ever mugged anybody in an alley!"

True in the most literal sense, yet also missing the point.