Where does it say that?

Edit: If you mean mac68k then yes, but that platform was dropped after the 5.1 release. http://www.openbsd.org/mac68k.html

HP300 and MVME68K are 68K. I occasionally crank up the latter for shits and grins, but support is far more a labor of love than for any utility these platforms might have left. See also: VAX.