toung, it all comes down to what aircraft your are flying!
Check your AFM and you might find things such as "AP coupled landing compliance has been demonstrated with CAT II and CAT III performance quality beams only" or similar. It means the manufacturer places a restriction on the ILS beam quality to perform an autoland, disregarding the actual met conditions.
On top, any simulated (actually only the CAT II or III is simulated...) autoland performed ouside LOVIS procedures takes place on unprotected ILS signals and might be subject to disturbance(s).
Hope this helps
