> that's the word you use until you know the correct one
"Accused of" and "allegedly" do this adequately. We don't know if this is embezzlement or if the firm's financial controls were so loose the CFO could plausibly and single-handedly "divert" cash like this. The title is generous, not incorrect.
If we don't know whether someone stole money the appropriate thing to do is say exactly that. Not make up something else and say that's what they might have done.
Legally speaking, Theft implies both the act of taking, and intent to deprive the owner.
Presumably he’s going to claim he intended to be the hero who doubled their runway with a clever trick, in which case “diverting” is the appropriate word.