Do we know that the urban myth about the nursery rhyme/song referring to the plague is false?

Do we know that the urban myth about the nursery rhyme/song referring to the plague is false?

if i can remember rightly, it is sang about the plague, i cant be 100% sure though

Plague interpretation
A popular interpretation connects the poem with the Great Plague of London in 1665, or with earlier outbreaks of bubonic plague in England. Interpreters of the rhyme before the second world war make no mention of this;[13] but by 1951 it seems to be well established as an explanation of the form of the game which had become standard in Britain. The Opies then remarked:[14] ‘The invariable sneezing and falling down in modern English versions have given would-be origin finders the opportunity to say that the rhyme dates back to the Great Plague. A rosy rash, they allege, was a symptom of the plague, posies of herbs were carried as protection, sneezing was a final fatal symptom, and “all fall down” was exactly what happened.’[15] Variations of the same theory then let it be applied to the American version of the rhyme and to medieval plagues.[16] In its various forms, the interpretation has entered into popular culture and has been used elsewhere to make oblique reference to the plague.[17] (For 'hidden meaning' in other nursery rhymes see Sing a Song of Sixpence, Mary, Mary, Quite Contrary, and Cock Robin.)

Folklore scholars regard the theory as baseless for various reasons: i) the late appearance of the explanation means that it has no tradition, only the value of its content;[13] ii) the facts described do not fit especially well at least with the Great Plague;[15][18] iii) the great variety of forms makes it unlikely that the modern form is the most ancient one, and the words on which the interpretation are based are not found in many of the earliest records of the rhyme (see above);[16][19] iv) European and 19th century versions of the rhyme suggest that this 'fall' was not a literal falling down, but a curtsy or other form of bending movement that was common in other dramatic singing games.[20]

http://en.wikipedia.org/wiki/Ring_a_Ring_o'_Roses

Hum,
i had always assumed that it was an urban myth.
But, recently, i would say I'm not so sure.