The movie industry does this all the time.
Johansson is probably suing them so they're forced to remove the Sky voice while the lawsuit is happening.
I'm not a fan of Sam Altman or OpenAI but they didn't do anything wrong here.
I will slightly rewrite the quoted bit to reflect reality as is currently known by the public: "otherwise we assert without evidence they used copyrighted audio". I'm fully of the opinion that everyone on both sides is wrong here, and I'm only right because I hold the most minimal opinion; that everyone needs to go outside and touch grass because this whole thing is bizarre and pointless.