Nah, it’s no more or less scientific than anything else. The scientific method doesn’t insist that scientists fabricate their samples from scratch, any more than they need to build their own microscopes or mine their own raw materials from the earth. People who make new materials send samples to other labs to characterise all the time; when Geim and Novoselov first synthesized graphene, they were mailing packets of the stuff to practically anyone who asked.
And in this case, a room temperature superconductor would be so striking that sending one small sample off to another lab, or even inviting someone in to check (which can be done extremely quickly) would quickly resolve a lot of issues.