I question accuracy of Arkham's analysis, although i certainly hope it'll pressure Saylor and Strategy to be more transparent.
With time they will be able to improve accuracy of their work on tracking Bitcoin portfolio of Strategy and they don't need to have a first perfect work.
Strategy is public company though, which means it's not solely owned by Saylor. Anyway, i think you expect too much from company who have history of doxxing users[1].
Bitcoin is a public blockchain that is not responsible for user anonymity and people including Arkham are free to do their on chain analyses. I really don't think such on-chain works are doxxing and prohibited by any laws. I could be wrong but I think doxxing on a public blockchain is an uncommon accusation.
Governments try to break down privacy and anonymity on blockchains so it sounds unlogical that they support any accusation or lawsuits of Strategy against Arkham or any on-chain analytics companies.