I am glad there is an overwhelming view that it is unsafe to ride on that tyre.
there are more than 200 different materials, both natural and synthetic, used in the construction of a motorcycle tyre: carbon black, silica, sulfur, plastics, vulcanizing agents,and Kevlar cords just to name a few. Some of these components will be effected by being soaked in water, gasoline or even oil, not to mention the fact that our bikes also use tubes which are even more prone to contamination from foreign fluids. When it comes to motorcycle or even car tyres, if you have to ask the question " is this tyre safe " then change it immediately, your life may depend on it.
Mick