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I choose to believe that those 22% were all just being pedantic about the definition of the word “shell” and whether a cell membrane constitutes a shell. Because the alternative is just too disquieting.
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I started Googling and, nope. After fertilization a vitelline membrane forms around the new zygote, but that's different from an eggshell, it's really quite separate, as you can tell if you crack a chicken egg: it's there in the chicken egg under the eggshell. Do get "zinc sparks" though.
The zinc spark is an inorganic signature of human egg activation - Scientific Reportswww.nature.com Scientific Reports - The zinc spark is an inorganic signature of human egg activation