Yes, the wiki pinouts are correct.
I thought the same when I first started looking into this exploit. I would have thought that the signalling from CELL to Syscon would not have involved SB at all but it seems Sony decided otherwise for whatever reason. I've attached an archive containing the...
At this point it seems like any late model slim or super-slim would need a modchip coupled with a special CFW containing all the required patches. We haven't found any pure software exploits in the boot chain yet so external hardware is required.
Thanks for the edit @sandungas! I've updated the write up to reflect the correct pin numbers between SB_INT and BE_INT.
BE_INT isn't crucial to the exploit as it only seems to be used during bootup per the HIG.
SB_INT is the important one as it's used whenever Cell has a packet ready for syscon...