This to me seems to be the null-hypothesis, and I see no evidence on the page that use in "greenfield projects" vs "brownfield projects" provides any more indication than a simple underlying "well designed" vs "poorly designed" metric.
For instance: why do people dislike Objective-C but like Swift? Could it be simply that Swift was expressly designed to ease pain points of Objective-C? Or is it, as this author claims, that Objective-C is in more legacy projects and if Swift were to have been invented first then replaced with Objective-C, people would suddenly love Objective-C and hate Swift? Same reasoning holds for C/Rust, VBA/Python&TS, Assembly/LiterallyAnythingElse [1], Java/C# [2], and R/Julia.
[1] I imagine if this author were to have been around to write this in 1980, they'd make a claim something like "People say the enjoy C projects more then Assembly ones, but in this essay I describe how this is actually just because Assembly is more likely to be used in existing codebases, and if Assembly had come around after C people would certainly prefer Assembly and detest C"
[2] Note C# is incredibly enterprise/legacy, yet well-designed. This supports the null hypothesis perhaps the most.