Sulfur is not an anti fungal. Sulfur is essential to ALL life and forms important amino acids which makes up proteins.
You are right but you missed the point of the forum.
This is about using inorganic sulphur,elemental sulphur ,to add it to the soil for lowering the ph.
We are not talking about the role of inorganic sulphur for life forms in wich case even fungi use organic sulphur compounds to kill bacteria( known as antibiotics) ,plants use sulphur compounds to kill fungi and so on.
Antibiotics if you remember,are yellow dust wich smell like sulphur but off course they are organic substances and the forum is not about organic chemistry .
It is also a verry verry strong antifungic used in medicine and to treat orchards.
Its used to sterilise vine barrels,beehives ,treat fruit trees against the most strongest fungus and its the reason why the apples from supermarket last for a year or so before they are sold on the market.