Wich or multi?
There is the possibility (so, so slight) that Hazlewood didn’t know exactly what a multiflora was. In his 1926 catalogue he put into his Climbing multiflora class, ‘Mlle. Cecile Brunner Cl.’, ‘Orleans Rose Cl.’, ‘Moonlight’, ‘Mrs. F. W. Flight’, Prosperity’, ‘Tausendschon’, and ‘Veilchenblau’.

It could be that the 1934 Patrick Grant comment was just re-reading an old Hazlewood catalogue But Dr. A. S. Thomas in 1950 definitely would have know what was a multiflora and what was a wich and he says ‘Cherub’ repeated lightly in autumn. Or did he too copy from past publications?

The main point for ‘Cherub’ being a multiflora was the 1930 U.S. reference where the rose, submitted by Hazlewood, gained a Silver Medal in Portland as a Multiflora. (But why did Hazlewood keep the rose in his Wich class for another eight years.) I’ll guess and say that many things slipped past busy nurserymen.

Repeating or Once flowering
The 1938 ref lists Cherub with other “early Summer Climbers” such as ‘Lady Medallist’ and ‘Milkmaid’ and those two in my garden are mostly once flowering. I have uploaded a 1924 reference which says “It also flowers in autumn when although the flowers are not numerous, the colouring is superb”. I think that most once flowering roses could produce a few flowers in autumn in superb conditions and perhaps other authors took this reference too literally. Hazlewood in 1925 said it flowered in autumn.

Thorns or Thornless
My plant has a few thorns, but I would call it thornless (or almost).

Is the Australian rose in commerce ‘Cherub’ or ‘Apple Blossom’ or ‘Blush Rambler’?
The 1997 reference, p213 shows that Trevor Nottle and Susan Irvine found roses “purporting to be ‘Cherub”, But was it? Or was it Apple Blossom or Blush Rambler? They did not have the resource of HelpMefind in those early days to help them through the tangles, and even now, with HelpMeFind, the three roses seem very similar.