No, gosimless does not provide an unlimited data eSIM for Australia. All of the plans listed for the Australian market have a fixed data cap of either 20GB or 50GB.
Travelers who need a larger data allowance can choose from gosimless fixed data plans such as the Australia 50GB – 30 Days plan for $22.49 USD or the Australia 50GB – 180 Days plan for $36.99 USD. These options give a specified amount of data for a set validity period and can be more cost‑effective for many users unless extremely heavy data usage is anticipated.