It also looks like the ILS wasn’t working, as a glide slope warning would have sounded. Also means no landing should have been atemptedsue to conditions.
ILS isn't the only option, although the reports about this crash haven't been clear about whether this specific Cessna 550 Citation was fitted with a GPS unit programmed for landings.
https://simpleflying.com/gps-guided-approaches-and-landings/
ILS was down and there was a NOTAM to that effect. He was desperately trying to key the runway lights ( keying the mike on airport frequency triggers the runway lights, not that he could have seen them in the soup), and he was attempting a landing below weather minimums for that aircraft configuration and he knew it. Get there itis. he FAFOed.
As I retired long ago, I have no up to date approach plates for this airport.
Bur first....there is no requirement that the glide slope must be working. You can legally shoot an approach using the localizer only....but the minimums will be much higher. How much higher depends on terrain and other obstacles.
But regardless of all of that, there is no excuse for being at tree top level two miles from touchdown.
Usually that happens because at some point well out from the runway, the pilot sees the ground and thinks he can “duck under” and make a contact approach.
With or without A GLIDESLOPE THERE IS NO AIRPORT i AM AWARE OF THAT PUTS YOU THAT LOW TWO MILES OUT. AT THE SMALLER AIRPORTS, 200 FT. IS THE ABSOLUTE MINIMUM AT THE APPROACH LIGHTS. If at that point you have the lights in sight or the runway you can legally land.
A clear case of pilot error.