I don't understand why it mentions a PF30 BB
Because it's just a set of top hat bushes to fit the 24/22mm GXP axle into 30mm ID bearings. It will work if you have 30mm ID bearings installed in an 86mm wide shell.
so it's a bb386 -> pf30 -> gxp convertor?
No, just a 386 to GXP, but 386EVO bearings are just PF30 bearing pressed into a wider shell.
@Sumo started
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Because it's just a set of top hat bushes to fit the 24/22mm GXP axle into 30mm ID bearings. It will work if you have 30mm ID bearings installed in an 86mm wide shell.