Steven Akins of that Ilk has not been officially recognised by the Lord Lyon as chief of the clan.
That does not mean that he is not chief of the clan. All it means is that no Akins has ever applied to the Lord Lyon to be confirmed in the plain undifferenced arms of Akins, so there is no judicial determination of the issue.
Under Scots law a person may call themselves what they like, provided they do not use their name for “fradulant purposes” However a person is unlikely to be referred to by a territorial designation in an official document, unless they are the person, the son or grandson of the person, who was so officially recognised by the Lord Lyon. The general rule is that everyone (mostly) knows their grandfather, but further back than that you have to prove it.
Sir Crispin Agnew of Lochnaw Bt, QC. Rothsay Herald, Court of the Lord Lyon