Well, the example sentence in your citation certainly looks like a plural, Bill. I would say 'great kudos' rather than 'many kudos'.

It did occur to me that if it's pronounced correctly (short o as in hot and the s as /s/ not /z/), it should be obvious that it's not a plural form. I was trying to think of any word that ends with a short o and takes a plural with s.

Bingley

Bingley