Georgism is an ideology.
They think the LVT will solve all social problems ever. That's the premise of the book he wrote about it.
He's basically like Marx, but instead of communal ownership of production he thinks taxing land value will solve all society's problems. Like communists, Georgists think if you just read this book and BELIEVE poverty will disappear.
The LVT has a lot of merits, but it has lots of drawbacks. It's difficult to value land as district from property, for one. It would also be highly inaccurate in the case of mineral rights and other factors.