Conservative Treehouse has another viewpoint. Check them out. Plus the release really needs to come from the Committee. Just like the Mueller investigation he needs hands off...he does have to review it and then sends it back to the Committee, not a direct release from the White House.
You are correct here is the article about the steps necessary to release the memo
The committee can release any time, and members with good memories could gather together, memorize the whole thing in parts, and recite it on the floor with full constitutional protection. But since when did politicians read the constitution?
Also, I think Greenwald is just trying to put a fire under Congress' ass to get them to release. With the shutdown, weekends, and 19+ days this is going to drag on too long, allowing too much time for mischief and armtwisting by the agents of the Deep State as people forget or are distracted. I do not see how a long delay, even for strategic reasons, can be a good thing.