It's not an "executive order." It's a change to the Regulations.
Potentially the most important thing in this whole mess is the new definition of the word "readily."
Yes, I agree that the definition of "readily convertible" has been changed to possession of an 80% lower, unfinished, and a corresponding jig or template for that 80% lower.
According to this rule, that constitutes a firearm.
(c) Partially complete, disassembled, or nonfunctional frame or receiver. The terms “frame” and “receiver” shall include a partially complete, disassembled, or nonfunctional frame or receiver, including a frame or receiver parts kit, that is designed to or may readily be completed, assembled, restored, or otherwise converted to function as a frame or receiver, i.e., to house or provide a structure for the primary energized component of a handgun, breech blocking or sealing component of a projectile weapon other than a handgun, or internal sound reduction component of a firearm muffler or firearm silencer, as the case may be. The terms shall not include a forging, casting, printing, extrusion, unmachined body, or similar article that has not yet reached a stage of manufacture where it is clearly identifiable as an unfinished component part of a weapon (e.g., unformed block of metal, liquid polymer, or other raw material). When issuing a classification, the Director may consider any associated templates, jigs, molds, equipment, tools, instructions, guides, or marketing materials that are sold, distributed, or possessed with the item or kit, or otherwise made available by the seller or distributor of the item or kit to the purchaser or recipient of the item or kit. The following are nonexclusive examples that illustrate the definitions:
Example 1— Frame or receiver: A frame or receiver parts kit containing a partially complete or disassembled billet or blank of a frame or receiver that is sold, distributed, or possessed with a compatible jig or template is a frame or receiver, as a person with online instructions and common hand tools may readily complete or assemble the frame or receiver parts to function as a frame or receiver.
...
Example 4— Not a receiver: A billet or blank of an AR-15 variant receiver without critical interior areas having been indexed, machined, or formed that is not sold, distributed, or possessed with instructions, jigs, templates, equipment, or tools such that it may readily be completed is not a receiver.
So it appears that anyone merely in possession of an "80%" frame or receiver, and a jig or template to complete the 80% frame, is in possession of a firearm, even if that frame or receiver has not been completed.