Rather than "deicing fumes" ingested into aircraft, its another case of deicing mix being ingested into the APU. The heat of compression in the engine decomposes the fluid and, among other things, you end with carbon monoxide and some other noxious fumes.
Seen it happen more than once. Only answer is to shut down air conditioning packs during deicing to prevent fluid ingestion. Purging the pneumatic system (turn on some ATM,s, etc) before turning on packs is a good idea to.