Actually, the Marcabians are pretty nice once you get to know them.
You're right; the sentences seem too long for Hubbard.
At one time I also doubted the authenticity of the Lucifer HCOB of 1980.
That was mainly because some of the writing, IMO, was not in Hubbard's writing style.
Also, I knew of no persons, who were around Hubbard during that period, who had confirmed its authenticity.
However, for quite a while there's been sufficient evidence from reliable people to confirm, for me, that it was - for a while - on the New OT 8 course.
Also, from a very high-up reliable source, I had it confirmed that Hubbard did author it, and that it came via Pat Broeker, who was extremely excited about it, and wanted a new OT level based on it.
I have a question as to whether it was typed by Hubbard, or was dictated by Hubbard. If it was dictated by Hubbard and, then, formatted by Broeker, perhaps Broeker added some small amount of content to bridge from idea to idea; however the core, essential, document, was Hubbard's.
It's in line with what Hubbard had been saying, confidentially, previously: Christianity is the result of implants. According to the HCOB, even the "second coming" was really an invasion of Earth by the Marcabians (extraterrestrial overlord implanters), an invasion which, possibly, with the creation of OTs on Earth, will be somehow prevented.
Hubbard, as any Scientologist knows, is the anti-implanter and enemy of the implanters.
Hubbard's 1980 reference to the Cabala (or Kabbalah, or Qabalah, etc.) is noteworthy, and his descent into yet more implant scenarios - this time with the implanters outside the physical universe - was predicable.
And you Captain Bill/Ron's Orgers will notice the similarity between the Lucifer OT 8 HCOB and Cap'n Bill's OT 8 (Super NOTs or 'Excalibur') level.
The Third Wall of Fire.
Wheeeee!
The news, in recent times, is the acceptance of the "Jesus was a lover of young boys" OT 8 HCOB by more and more outside of Scientology Inc. Scientologists.
For example, BIC's (the South African Blog, 'Back In Comm') estrangement with the Milestone 2 people, and BIC's acceptance of the 1980 "Jesus was a lover of young boys," etc., OT 8 HCOB as having been written by Hubbard (and resultant defensiveness and protectiveness of it), and BIC's acceptance of Ron's Orgs, notably its OT 8, called 'Excalibur', which appears to have been inspired by the 1980 OT 8 HCOB:
both have to do with hidden conspiratorial influences from outside the physical universe that are keeping Scientology OTs from experiencing their full OTness.
Now full OT is just around the corner!!!