The Variables in Post Snippets (WordPress Plugin) is a comma seperated value. When you use the snippet-insert button in the post/page editor, you can set those.
An example of this is given on the homepage of the plugin, there is even a screenshot demonstrating that. Please read the documentation first.
Those Post Snippet Variables are totally unrelated to PHP variables. I think that’s just the thing you missed. You were looking in the wrong direction.
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