The FAQ is just a guide, obviously you need to use your own best judgment when reading it... i386 and amd64 are for the most part identical platforms up until a certain point, the bootstrap procedure is identical and disks are partitioned in the same way.
fdisk is used to create and/or edit MBR-style partitions, the format for these is classic x86 IBM PC.. it contains a small bit of executable code and a table of partitions and their specifications (CHS boundaries/LBA sector begin offset and size).
Some systems support GPT/EFI-style partitioning, but this is not supported by OpenBSD.
It's technically possible to initialize a disk without adding a MBR-style partition table on both i386 and amd64.. but you cannot boot from it, and OS's not aware of BSD disklabels may inadvertently overwrite data on your disk, so it's a good idea not to do this.
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