BDS is not unlawful at all. Putting sanctions aside, given that only governments can sanction, boycott and divestment are .just other names for ethical consumption and investment. Dan Avnon was not boycotted - his request for support for his application was declined. Australia is not Israel. A court cannot order a person to cease personal support for a political stance, enforce a person to consume, invest or support an application against their ethical standards or restrict freedom of expression. The greater the gaze upon Israel and its occupation, the greater support for the Palestinians and their request for international support for BDS.
Chief PA negotiator Erekat: Talks to minimize IDF control in W. Bank's Area A ended (Haaretz)
from the article: Landmark case puts 'anti-Semitic' BDS on trial in Australia