SMD is Surface Mounted Device.
SMD is not a specific type of capacitor.
Unless you meant Tantalum capacitors, which this design has several of.
BUT Tantalum capacitors are solid state capacitors, which you said don't work.
Either way what you said doesn't make sense.
I think what you were trying to say is that those fast switching regulators need very low esr caps, which is where tantalum and ceramic caps come into play. But even so you still need several thousand uF's of capacitance between the rails and the first phase, and between phases. And these can only be done with electrolytic or polymer caps (SMD or through-hole)
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