The issue will be fastening that pedestal to the floor in a manner that secures it well enough, where you trust it to stay secured when things get rough. It's generally not an "if" things get rough, but "when".
Point being, it's doubtful the existing floor is reinforced well enough where you can just screw a pedestal to the floor and expect it to hold. The floor must be reinforced underneath (or on top I suppose) with at least one additional layer of plywood.