You’re thinking about the University of Rochester group, which claimed room temperature high pressure superconductivity, and whose work was indeed riddled with fraud. This is a different group which claims room temperature and pressure superconductivity in a totally different material. They’re sketchy in different ways, but have not previously been down to be frauds (to my knowledge). At most, a bit cranky in their understanding of the underlying theory. Which is why several groups are keeping an open mind and trying to replicate this.