Pyramids and the Great Seal are not and have never been Masonic symbols.

https://www.greatseal.com/mythamerica/notmasonic.html

https://www.reddit.com/r/freemasonry/comments/zvvq9l/the_all_seeing_eye_in_the_pyramid/

https://themasonicblog.blogspot.com/2009/09/is-pyramid-masonic-symbol.html

https://blog.freemason.org/2025/02/14/freemasonry-symbols/

https://grandlodgeofiowa.org/docs/Symbolism/EyeinthePyramid.pdf

https://scottishrite.org/scottish-rite-myths-and-facts/eye-in-the-pyramid/

https://www.cbsnews.com/news/9-things-you-didnt-know-about-freemasonry/

https://masonicjewelryblog.net/freemasonry/1268-is-the-seal-of-the-united-states-a-masonic-symbol/

https://masonicshop.com/encyclopedia/topics/entry/?i=1714

>But what about what Manly Hall said?
>"Not only were many of the founders of the United States Government Masons, but they received aid from a secret and august body existing in Europe, which helped them to establish this country for a peculiar and particular purpose known only to the initiated few. The Great Seal is the signature of this exalted body - unseen and for the most part unknown - and the unfinished pyramid upon its reverse side is a trestleboard setting forth symbolically the task to the accomplishment of which the United States Government was dedicated from the day of its inception."

It's a quote from The Secret Teachings Of All Ages. The book was written in 1928.
Manly Hall didn't become a Mason until 1954 and thus didn't really know what he was talking about.