Have not really been following this, mostly because I really don't care about it, but Arkham has been wrong before with who owns what addresses.
In the end does it really matter? It seems to be their thing. Wait for people to make noise about some holdings and then come out with a press release saying "we found them" and then when it's shown not to be accurate never mention it again.
-Dave
They might have been wrong before, however, you cannot declare for certain that they are wrong on this tracking on Strategy's wallets. Also, it is also very much important to know how many times Arkham has been wrong compared against how many times Arkham has been correct in their findings.
In any case, it does not matter for you, however, to avoid fuddering Michael Saylor and Strategy's very big investment on bitcoin, this should be tracked and audited.