The 1990 book Sleeping Beauty: Memorial Photography in America says:
To remove the stigma of death from the home this "death room" became a "living room" by simple decree by the editor of the Ladies Home Journal. By the end of the first decade of the twentieth century more and more funerals were being performed in Funeral "Parlors." And the home no longer had a "parlor." The "living room" became a true room for the living.
...
Edward Bok , editor of the Ladies Home Journal , stipulates that room designs for the Journal never show parlors , but rather “ living rooms".
The 1921 book A Dutch Boy Fifty Years After by Edward Bok says at page 136:
and in place of the American parlor , which he considered a useless room , should be substituted either a living - room or a library .
The closest I see in the actual Ladies Home Journal is September 1887:
A really handsome, tasteful parlor - and not a grand apartment by any means, but one that might better, perhaps, be called a "living-room" —is a far rarer sight than a pretty bedroom ; and when not much used, it is too often all piano and carpet. It is to be supposed that there are a few other things in the room; but the piano as large and the carpet loud, and attention is therefore riveted upon them. With dead-white walls for a background, a more unhappy combination could not well be inspired. And all this ugliness, when charming rooms can be had under the most adverse circumstances.
However, the point of Bok in his book is that his house plans would avoid having a "parlor" and instead have a "living room".
So the term "death room" was not used as the permanent name for the room, the issue is between "parlor" and "living room" and Ladies Home Journal avoided "parlors" in favor of "living rooms" prior to the time frame mentioned in the blog.