No, if there were silicon life forms on another planet that used silicon oxides as genetic material, and then on that planet a DNA-based organism were found evolution would also be falsified. Since the alien planet scenario is completely hypothetical, however, let's deal with what we can observe, namely life on earth. It is certainly theoretically possible to falsify evolution based on earthly observations. Just find that silicon-based creature. Or that pre-cambrian rabbit fossil.
All that you are claiming is they both can't exist in parallel. Dance around the point all you want, but your 'test' is a sham.