Of course it’s subjective. The terminology of the left-right political divide originally referred to 18th-century France. In the 21st century, we’re usually not defining the political center of a nation by how it compares to the French Parliament of 250 years ago. The center moves over time and space, and the left and right are relative to that center.
I do think this comment thread is confusing people, though, as noted in an above edit. For clarity, nobody is saying neoliberalism is a center-left movement.
The linked page specifically tracks Lemmy, although it’s not clear to me whether it’s tracking posts by users from Lemmy instances or posts to Lemmy instances, which is a medium-sized distinction (the latter would include kbin, Mastodon and other Fediverse users who are posting to Lemmy from their home instance, while the former would obviously include only Lemmy users).