Title is very misleading. What has been demonstrated so far is a failure to replicate. It could mean that the first study was erroneous, or the second one, or that either one was a fraud. Fraud is one of the possibilities, not a definitive fact.

Interestingly, there is actual fraud mentioned here, but it's not the main story.

The group learned some painful lessons. After a preliminary inquiry, a UU panel dismissed the request for an investigation in a terse report and berated the team for failing to discuss its concerns with Lönnstedt and Eklöv in a “normal scholarly discussion.” Lönnstedt said the group was simply jealous. The accusers spent many months gathering additional documentation, at the expense of their own research. In April 2017, Sweden’s Central Ethical Review Board concluded there had indeed been “scientific dishonesty” in the research, and Science retracted the paper; 8 months later, a full UU investigation concluded the data had been fabricated. (Eklöv blamed Lönnstedt; Lönnstedt maintained her innocence.)

One of the scientists managed to avoid the Gellman Amnesia effect:

The brazenness of the apparent deception shocked Jutfelt. “It really triggered my skepticism about science massively,” he says. “Before that paper, I could not understand how anyone could fabricate data. It was inconceivable to me.” Now, he began to wonder how many other papers might be a total fantasy. The experience also taught the group that, if they were ever to blow the whistle again, they would have to bring a stronger case right from the start, Clark says.