What it means by "a scandal narrative failed to gain traction" is that the mainstream press ignored the actual contents of the hack and focused entirely on fals

What it means by "a scandal narrative failed to gain traction" is that the mainstream press ignored the actual contents of the hack and focused entirely on falsely discrediting the information it contained as fake (a claim which fell apart almost immediately, at least for all the Hunter Biden emails which were politically interesting - something the non-conservative press has actually just started to notice), objections to the morality of using hacked data which are mysteriously absent here, and of course endless articles about how "conservative media" were using it. It's remarkable how whenever something happens that's politically inconvenient to Democrats, most of the US media coverage ends up being about the Republican reaction to it! In fact, that sentence from Wikipedia is a downstream consequence of this ... at least in theory, their policy is to just regurgitate the mainstream media narrative. Remember, too, that the Hunter Biden emails involved the future president of the USA and his family whereas this involves random obscure anonymous internet users that none of the Seattle Times' readers would even have heard of had prior to the press deciding to go after them. It takes an extremely partisan notion of newsworthiness to consider the latter worthy of reporting but not the former.