The short answer is: Chapman can be either. The name describes a Nigerian party-drink style, not a guarantee about alcohol content.
When Chapman is a mocktail
A Chapman is non-alcoholic when every ingredient is alcohol-free. That usually means citrus soda or juice, fruit syrup, cucumber, citrus slices, and alcohol-free bitters or another spice component.
When Chapman is a cocktail
Some recipes use aromatic bitters that contain alcohol, while others add gin, vodka, or another spirit. Even a small dash of traditional bitters means the recipe may not be strictly alcohol-free.
How ZZAI handles it
ZZAI Chapman is a non-alcoholic sparkling drink. Serve it cold, pour it over ice with cucumber and orange, or use the Chapman Party Punch recipe for a larger gathering.