Tulsa was well into the early era of modern mass media. Particularly on the Newspaper end, with telegraphs already being well established and the ability to send photographs over them having been recently developed. Radio broadcasting was starting to get established as well, and the record business was well established
But the early 20s were basically the high period of the US twice a day newspaper business. By the 20’s William Randolph Hearst was already a household name, and owned the largest media conglomerate in the world. Wire services were well established with the AP already being decades old.
Something worth noting is that a lot of that technology had been developed to help in reporting the Civil War. Which is often considered to be the first American war to garner modern news coverage. With dispatches from battles published the very next day.
News could be propagated rapidly across the nation, and globally not much slower.
Tulsa seems to have been widely reported at the time. But how it was reported is definitely a thing. It was uniformly labeled a “race riot” and many papers seem to have focused on the handful of white deaths.
If memory serves Tulsa had already been a presence in national news, with the “Black Wall Street” moniker coming out of press coverage. Some times positive. Progressive Northern papers and Black papers in particular covered it heavily. Even reporting on prominent citizens in their society pages as far away as NYC.
But it was also the era of the 2nd Klan, so a decent chunk of the country would have viewed the destruction of a wealthy, successful Black community as a good thing. I always tended to think Tulsa got hammered so hard because it had attracted so much attention. Cause it wasn’t the only community to get wiped out this way.