With all due respect for the forensic chemists and their good work on identifying an unknown substance, it is fairly common for forensic groups to once in a while detect new chemical analogs of known drugs. A few years back, lots of new cannabinoids and cathinones were getting released constantly as older analogs were getting banned. Often, these novel analogs are pharmacological low hanging fruit. The drug in this article is also such low-hanging fruit: it is well known an N-methyl to N-ethyl substitution does not lead to reduced activity in this category of arylcyclohexylamine dissociative anesthetics (this was actually one of the SAR considerations taken by the designers of methoxetamine!). And indeed, this very same substitution was used here on 2-Fluorodeschloroketamine, leading to the drug from the article.

PS the Chinese abbreviation for "CanKet", 2F-NENDCK, most likely stands for 2-fluoro-N-ethyl-nordeschloroketamine. It is almost certain this drug was synthesized by a Chinese custom synthesis group (the most typical source for these type of substances at scale) and not by Australian clandestine chemists.