Unlike "classic" Philadelphia-style ice cream, this recipe contains eggs. If you do not want to use raw eggs (or any eggs), feel free to omit them - that will, however, affect the consistency of the ice cream, making it all the more recommended to enjoy the final ice cream as fresh as possible.
As noted, if you prefer a "pure" vanilla base, do exclude the cocoa-powder and the coffee liquor, and instead add another teaspoon of vanilla powder. If you still would like to use some alcohol to make the ice cream softer (in case you plan on saving it in the freezer for later eating), you could instead use some neutral alcohol, like vodka.