Yes and this is not the only error in the article. I'm not even sure what this is supposed to mean:

""" Every operation which preserves a lattice and doesn't use "incomparable" objects is equivalent to addition. """

And the statement at the end: "any lattice is equivalent to another lattice where the relationship is set inclusion." This only holds for distributive lattices.

For another take on lattice theory, and ordered structures more generally:

https://www.azimuthproject.org/azimuth/show/Applied+Category...