Yes, you still qualify if you buy between the record date and the ex-date and the ex-date is AFTER the record date, as is the case for > 25% distributions. And I've already tested it twice with other stocks (after I got totally screwed with the FABU/LSYN spinoff because nobody not even the company could answer the questions I had at the time).
BUT, SIAF could be that very extraordinary special case which is different. Just a hunch I have. Perhaps there will be no ex-date (cut-off date) and we all qualify on Oct 31. That's why I said let's wait and see what SIAF says in their press release. Usually... there always has to be an ex-date though. And it is always determined by the exchange (FINRA). Not provided by the company.