I’m not 100% about this, but I have collected from
across the net that “kudos” is both singular AND plural.
HOWEVER, there is a pronunciation difference. The
singular has a voiceless “ss” sound and the plural
has the “z” sound. The first syllable can be pronounced
“koo” or “kyoo”

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The column to which the original post refers is «What’s the origin of the word “kudos” ? (13-Sep-1999)»

Merriam-Webster’s Collegiate Dictionary has this to say on the subject: