The mold (Chaetomium globosum) that produces Chaetoglobosin A (CHA) is fundamentally an indoor environmental mold, not an agricultural mold. CHA gets into the body via grains and cereals that have been stored in facilities with the mold growth that occurs from water damage (humidity, water intrusion, and/or poor ventilation) in the facilities.
Both the report comments and interpretive guide are accurate; however, they answer different questions:
What type of mold produces it? → Environmental, water-damaged building mold
How is someone most commonly exposed? → Ingestion of contaminated grains/cereals
How is someone less commonly exposed? → Inhalation of indoor spores