[edwin hubble]

"...treacle..." End of story! No one says that, except people with too much time on their hands or dependent on a Thesaurus!

This is a British publication.
"...treacle..." is a very common term in England.
Sugary sweet...

[Nogbad]

"...treacle..." is a very common term in England.

They sell treacle in my local variety store.
In fact in Canada and Great Britain it is as ubiquitous
as the Oxford English Dictionary
which still is the only standard for the English language.