Valve has to ask for those dev kits. They are not expensive (anymore) and Sony is great with helping with coding issues now. Their toolset is much improved (and in some eyes better then the x tools now).
Sony has been actively dessiminating programming techniques to any and all who care.GG, Insomniac, etc all have been helping out with tools and programming help.
To see a picture of this... look at what Sony has done at past GDC
PhyreEngine compiler tools, Nocturne Library, Edge Tools, Code Profilers
They have even sent in technicians to help when developers could not find their way around an issue lately.
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