This policy supersedes the Media Policy for Arlington National Cemetery (ANC) and the Soldiers’ and Airmen’s Home National Cemetery (SAHNC)

The ANC is irrelevant in this case.

Filming or photographing will not be permitted if it conveys the impression that cemetery officials or any visitor or family member is endorsing any product, service or organization.

Firstly, it doesn’t seem that Trump violated what you cited, since he took no pictures, nor is there proof that he ordered anyone else to take any pictures. Secondly, it’d take a narrow interpretation of the pictures to presume that they’re meant to endorse Trump himself, any more than images of Joe Biden earlier this year were meant to endorse Joe Biden’s campaign (www.upi.com/Top_News/US/Photos/…/14636/). Families like having pictures of an authority figure paying respects to their fallen loved ones. They reached out to Biden and Kamala Harris first, after all, which doesn’t seem to me like they were aiming to exactly join Trump’s campaign.