tux67
For sure, the X4 passes this point and fits the description - but what to do with this information? X4 is already mapped:
https://hiking.waymarkedtrails.org/?lang=de#route?id=303316

There is also no other "Xx" Trail mentioned if you look up the information via the "official" Source:
https://www.bezreg-koeln.nrw.de/brk_internet/geobasis/touristik-und-freizeitinformationen/index.html
Can be visualized here:
https://www.geoportal.nrw/themenkarten