They acknowledge it, but they fail to address it. The fact is, if most academic philosophers around the world are largely focused upon the works of the Euro-Americans instead of non-European philosophers, then it stands to reason that the others were simply inferior, less useful, incomplete, or less impressive. Otherwise, they are implying that the academic rigor of an entire field of study is tainted by cultural bias - the very thing that academic structures are designed to counter. That is a bold claim and would require far more than an article like this (which is essentially just a complaint, not an actual counter argument) to justify.