No, it’s not, since internal space of megalithic structures are barely adequate for modern humans, and therefore — by Occam’s Razor — wouldn’t have been appropriate for giants. The architect of the Great Pyramid was buried on the Giza Plateau, and the tomb isn’t giant sized.
If one reads (1) the Greek accounts in the original Greek, not English translations, you will find therein that the master builder Hephaestus had two Giants Cyclops working for him, actually building giant structures for him.. The Cyclopean walls in Greece are, as Homer described them, as “well-built walls” using a very unique original Greek word just for that type of walls.(2) If one couples that with Enoch descriptions good giants piling huge block of stone to imprison another bad giant and (3) Solomon`as use of a jinn to move the Temple foundation stone it to Jerusalem, and (4) Pashto oral tradition telling of Giants, descendants of Nimrod, [”Nimrod built cities*” ] hiding in caves west of Khandahar to this very day , one comes to the conclusion that ancient Greek and Hebrew sources speak of giants moving and building megastructures. Thus it cannot be mere coincidence that two ancient accounts and one modern day account describe the very same thing under discussion and in reality as a megalithic structure. Even a third grader can figure this one out. One has to read it in the original Greek to acsertain the meanings of the words in context. Modern-day translations are not done by engineers nor scientists nor architects but by scholars who know nothing about engineering,
science nor archutecture.
*”Genesis 10:9-12
Cush was the father of Nimrod, who became a mighty warrior on the earth. He was a mighty hunter before the LORD; that is why it is said, “Like Nimrod, a mighty hunter before the LORD.” The first centres of his kingdom were Babylon,
Uruk, Akkadand Kalneh, in Shinar. From that land he went to Assyria, where he built Nineveh, Rehoboth Ir, Calah
and Resen, which is between Nineveh and Calah - which is the great city.”
The King`s Chamber is 40 feet high, perfect for a giant.