Why is this in help? Do you need help with anything?
The solution to that thread is to follow the instructions here: Exporting with citations - #5 by Feralflora
And to make the citation examples work, just use the right Pandoc citation syntax, as seen here: Exporting with citations - #19 by Feralflora
In that thread, the problem with the citation examples was using the wrong citation syntax.
The csl style argument is redundant, because you already specified that in the properties / YAML.