SIAF does NOT perform accounting for its subsidiaries. To say that would imply that it's also engaged in accounting, considering its many subsidiaries.
What you've posted is a letter from SIAF's independent auditor confirming that it has independently audited the financials of SIAF and its subsidiaries.
If independent audits are to be trusted every single time, then we wouldn't have Enron, WorldCom, HP-Autonomy; housing bust, banking collapse, and all the recent Chiscams because those companies involved all had independent auditors. Some of those auditors were the top accounting firms.
All I'm saying is that although SIAF has explosive potential, I wouldn't blindly go all-in.