The YouTube print that comes up in a search is quite bad.
Is film noir recognized as being a pre-1940 phenomenon via this pre-1940 film or any other such films so widely as to be "already very well established"?
Among whom? Blackboard members? Critics? Blog writers? Book writers? Film fans?
I'm sure that there is a degree of recognition, but how wide is it actually? I am going by the "popular" side, not the critical/academic side where these things first are discussed and where your observation may be accurate.
The FNF blurb on "What is noir?" doesn't even hint at this. And there are other sites that do not go into the 1930s material or else call it "pre-noir". If we search Google on "when did film noir begin", what pops up first is
"Many of the films during the 1930s and early 1940s were propaganda-type films that were designed to cheer people's bleak outlook during the hard times of the Depression and World War II. It was beginning in the early 1940s, that film noir, such as The Maltese Falcon and Laura, began to appear."
The Wiki article hasn't seen the pre-1940 light yet. Neither has Quora. In fact, site after site continue the same line as if Hollywood and 1940 were a birthdate for noir.
"On the Night of the Fire" is a full-fledged noir and it does appear in critic lists, properly, but does that mean it's recognized or that the true nature of noir development has been recognized and is now well-established? I have my doubts.