GLFW window reentrancy

I'm writing my own GLFW class wrapper and stumbled upon function reentrancy question.

GLFW documentation states that some functions are not reentrant (glfwCreateWindow, etc.) and "must not be called from any callback function".

Now consider the following code:

int main() {
    try {
        vkc::glfwWrapper a, b;

        a.createWindow(640, 520, "a");

        a.onClose = [&b](auto self) {
            b.createWindow(640, 520, "b");
        };
        b.onClose = [&a](auto self) {
            a.createWindow(640, 520, "a");
        };

        vkc::glfwWrapper::waitEvents();
    }
    catch (std::exception& e) {
        /* do stuff */
    }

    return 0;
}

onClose is a std::function thingy and is called on close callback. glfwCreateWindow will not be called with the GLFWwindow that belongs to callback. But what about GLFWwindow that does not belong to callback?

Wikipedia states that, "In computing, a computer program or subroutine is called reentrant if it can be interrupted in the middle of its execution, and then be safely called again ("re-entered") before its previous invocations complete execution." Technically that means it should be safe to do as I did, because I'm not interrupting anything, however that "any" really misleads me.