He states it took 1000 attempts with two steps in the process requiring a "stroke of luck". This doesn't sound like it's going to be easy to replicate or verify.
The fourth step, chromatography, ensures that every height on the test film is a consistent compound, from then on you'd figure out which compound that it is, and reproduce it separately and retest it, which is what they claim to have done.
That's the search for materials he's talking about, not 1000 attempts and 2 strokes of luck to synthesize the identified "superconductor."