Yes. The article is click bait. With such a title I would have expected majority of the area to be dummy, but it is just structurally more silicon, exactly like a picture may be majority of its mass wood.
Your statement is incorrect. The analysis was made by a professional firm - dummy silicon shims are used because the dies are thinned, as per AMD's own disclosures. Those silicon shims are bonded to the compute and SRAM dies.