Is khk-group.de a Disposable Email?

curl https://trashmail-blacklist.org/check/json/khk-group.de

import requests

r = requests.get("https://trashmail-blacklist.org/check/json/khk-group.de")
data = r.json()
print(data["status"])  # blacklisted / whitelisted / unknown

const r = await fetch("https://trashmail-blacklist.org/check/json/khk-group.de");
const data = await r.json();
console.log(data.status); // blacklisted / whitelisted / unknown

<?php
$json = file_get_contents("https://trashmail-blacklist.org/check/json/khk-group.de");
$data = json_decode($json, true);
echo $data["status"]; // blacklisted / whitelisted / unknown

package main

import (
    "encoding/json"
    "fmt"
    "net/http"
)

func main() {
    resp, err := http.Get("https://trashmail-blacklist.org/check/json/khk-group.de")
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    var result struct {
        Status string `json:"status"`
        Domain string `json:"domain"`
    }
    json.NewDecoder(resp.Body).Decode(&result)
    fmt.Println(result.Status)
}