Apart from the obvious issue, I thought you couldn’t receive Eagle after your 18th birthday. Or have they changed that, too?
You must finish your Eagle Scout project and have earned all relevant badges etc. by your eighteenth birthday. The board of review can be done after 18. I have a friend who was 17 when he finished his requirements but couldn’t have his review board until two years later because he had joined the Navy in the meantime. Theoretically there is no time limit on the board of review, or there hadn’t been anyway.
The BSA made a temporary rule change for older Scouts (age 16-17) who joined for the first time in 2019. The temporary rule change allowed these new older Scouts (female and male) to apply for a limited time extension for the purpose of earning the Eagle Scout rank, which takes a minimum of 19 months to earn due to tenure and other requirements.
Based on this article, this trans woman should not have been eligible for the time extension, because she was not really a new member — she was a former member of a Boy Scout troop who decided to drop out.
Maybe in addition to identifying as a girl, he also identifies as a 17 year old.