As someone working in Germany, that seems unlikely to me. A works council influenced by the company would like be struck down quickly, senior/mid management (e.g. directors and up) are even disallowed to participate/be elected as far as I know.
Its more likely to me that they use that copyright as they are an official and legal part of the company as works council.
Works councils are legally recognized parts of their companies and generally use company branding, besides of course using the company offices, work hours and infrastructure to conduct their legally-protected business.
This is probably the AWS lead initiative to place their preferred people into a council they see being formed anyways.