Original memorandum:
http://www.vkblaw.com/news/six.htm
It states 90-day policy. I guess, it did not mention it does not work across the year end because it was obvious it cannot be applied across the year end. USCIS had only one pipeline then (as it does now), and before the year end all letters go to the pipeline of the previous year. After the year end they all go to the pipeline of the new fiscal year.
That is why if a letter is received by USCIS before year end, it automatically applies to the previous year and cannot be applied to the new one.
Memo #1
Memo #1 confirms that the original memorandum is still in force. It mentions the fiscal year issue too (so that those who do not know USCIS has only one pipline that switches on October 1st, would know that).
Memo #2
Memo #2 has Q&A form. I'll rephrase it.
Q. Is it true the original memorandum is still in effect?
A. [Absolutely.] Just make sure USCIS receives the letter any time during the same fiscal year (remember my comments to the original memorandum - here they mention it because the fact they have only one pipeline is not obvious outside, though it is obvious inside). If a problem still occures under conditions mentioned, let us know.
So, all three documents state exactly the same thing. And that is crystally clear.
Regarding
We are not aware of any single case where they filed within 90 day period AND within the same fiscal year and were still denied. All cases of early denial for 90-day memorandum applied to admission done in a previous fiscal year (versus the DV program where the applicant participated and won). That was expected, because the second condition was violated - and the application went into the pipeline of a wrong year, where the applicant did not have a petition approved.
Those three are all very much consistent.
They do not care about the changes. They have always had only ONE single policy since 1999. That is all they know. And when the pipeline switches to the new year or before it switches they have to apply original memorandum only. The switch in pipeline is beyond what the employees need to know. They just see an applicant for DV-2008 did not win DV-2008 (though he won DV-2009). So, that is the reason for denial if the application is done before October 1st.