I read it as SDF so I knew what you meant. I am not even sure what the
new abbreviation is, and I am a little surprised they changed it.
It's still SDF ...
You may be a bit confused as that is the IATA-naming, while the ICAO is KSDF.
"K" means an airport in the USA, and they just prefix the IATA-code with it.
In other parts of the world it's different, for example:
Brussels IATA > BRU ICAO > EBBR (EB > Belgium)
Amsterdam IATA > AMS ICAO > EHAM (EH > Netherlands)
London Heathrow IATA > LHR ICAO > EGLL (EG > Great Britain)
Paris De Gaulle IATA > CDG ICAO > LFPG (LF > France)
Frankfurt IATA > FRA ICAO > EDDF (ED > Germany)
Madrid IATA > MAD ICAO > LEMD (LE > Spain)
Etc etc etc ...
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* Origin: AVIATION ECHO HQ (2:292/854)