The title makes it sound like this is a variant of Lua, or somehow largely compatible.
The page itself is more clear, calling it a "programming language with a Lua flavor".
Emphasis on "flavor".
I feel like the list of differences from Lua is about as big as the similarities, and it's definitely not a drop-in replacement, at least in its current form (contrast with something like LuaJIT).
As a strategy to get adopters, it could also have value. There's a small but widely spread group of people who have been exposed to Lua in various games and programs.
Beyond that, I have grown to somewhat dislike Lua over the years due to the typical complaints, but also because it's tough to read and write. The keywords are so bulky and whitespace practices are random, requiring a linter. I actually like using brackets instead of do/then/end because brackets stand out more. When you're tossing functions around left and right, it's annoying to write out "local function" everywhere. I also am ambivalent about using metatables for implicit behavior that can be non-obvious to the code reader.