That is a mailing list post (tech@) archived on a forum, did you read it? the changes add support for 88SE* based devices.. not 88SX*.
If the controller in question does support AHCI (..but messed up the standardized way of indicating this) it may be possible to force the driver to attach in a similar fashion.
I'd recommend checking the BIOS and seeing if the mode of the controller can be toggled, i.e: AHCI vs. IDE vs RAID mode.. if it's in RAID mode, OpenBSD usually won't attach to it.
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