I think you are confused. The 175 million users is in reference to total amount of subscribers using Prime Video at the time of the Q1 report. It does not reference a specific series let alone Rings of Power that wasn't even released at the time of the statement. It is also rare to use weasel words during SEC reports. While any fine is likely a blip to Amazon it is still something companies usually want to avoid. It could also open up lawsuits by share holders if they were mislead or lied to.
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85% of subscribers to a shopping service making use of a secondary benefit is not great? It is amazing how much people hate on the show (and apparently amazon) that something like that has to be anything but good.