The process they describe for making it is simple, takes a bit over 3 days, and the tools and ingredients are fairly common. I would hope someone tries to replicate this ASAP and we start to see whispers of the validity of this soon, like in the next week or two.
The only other Superconductor news that I can think of recently involved Ringa Dias, who has had to retract a couple of his papers. I can't find anything about this team having retracted papers regarding Superconductors.