judging by past answers given, no. this is just so you can develop on serenity using zig, but anything in-tree needs to be C++ (or Jakt once that's ready)
It's more about integration into the rest of the system. E.g. the jakt and serenity string classes differed, so now the old string class has been deprecated and replaced by the jakt one. I'm not actively involved in the project though so I couldn't tell you much more than that
