I don't want to be splitting hairs but when clicking on a link in the first "requisite for eligibility" at [1], I get an answer:

Requisites for eligibility[edit]

  1. The proposal is to open a new language edition of an existing Wikimedia project that does not already exist (see the complete list of Wikimedia projects or the SiteMatrix).

That answer being that WikiData is listed among the "existing Wikimedia projects", i.e. when there is a request to open a language (or a language variant) in WikiData, LangCom makes a recommendation whether to allow that language, yes or no.

On the issue at hand, my vote is 'yes', i.e. to allow en-AU and en-US to be used in WikiData for monolingual text.

Fwiw,
Oliver

[1] https://meta.wikimedia.org/wiki/Language_proposal_policy#Application-procedure


On 12-Nov-17 19:26, Milos Rancic wrote:
On Sun, Nov 12, 2017 at 6:50 PM, Gerard Meijssen
<gerard.meijssen@gmail.com> wrote:
Absolutely. There is no reason why en-AU or en-US are not valid and cannot
be used in WIkidata for monolingual text.. That is a particular property in
Wikidata. What is a problem is that at the same time codes are given a
meaning that does not follow our language policy.  The policy exists to
prevent the abomination of using codes for something different.
There are two policies which define work of the Language committee:
* https://meta.wikimedia.org/wiki/Language_proposal_policy
* https://meta.wikimedia.org/wiki/Proposals_for_closing_projects

May you tell us where it says that it deals with Wikidata content?

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