According rumors, pilot reported field in sight. Guy in AFIS had a/c in sight ,
.
The answer might lie here :
eddf 011820z 01005kt 8000 few002 08/08 q1025 nosig=
eddf 011850z 01004kt 7000 bcfg mifg few002 07/07 q1025 tempo bkn002=
Speculation : entering a lonely stratus. losing sight of PAPI and trying to go under the stratus to regain ground visual contact ? done that myself.. but not at night... and not in a Citation.
At night with that wx, VFR at 150 Kts ? why not divert to EDDF ? If you can afford a Citation X you should be able afford the landing fee and a short taxi ride no ?