From the article:
> Easy is subjective. But simple things are simple because they do not complicate; they have fewer concepts. Simple is objective.
I'd argue both are subjective, or with a better word: relative.
I'd say Zig is easier and simpler than C in almost all regards. The article does not specify what Zig is compared to in order to make these statements. Probably the author had C in mind, but that was not explicitly mentioned.