I can only assume this headline is trying to get attention - even international engagement. Rather than hanging the potential policy on a foreign name,…

The headline is purely a product of the article’s author and/or Guardian editorial staff. Most of the article isn’t even about the Greens investment property tax, it’s about worldwide politics.

The Greens have an alphabetically sorted list for all their policies at https://greens.org.au/vic/policies - the described plan seems to be a more specific Victorian version of part of their Finance and Public Administration Policy - "3. Replace stamp duties with land value tax. "