• 14 words in the post, an allusion to a notorious Nazi formula
• 1884, birth year of Anton Drexler, a far-right politician who founded what later became the Nazi Party
• 1488 and 88, notorious Hitler-related numerology
• Painting showing Manifest Destiny and a bunch of other white people chasing Native Americans into darkness

I think we can safely conclude that Homeland Security are deliberately sending Nazi dogwhistles on their social media.