it's entirely non trivial. cloning genes is tedious, slow, manual labor. People are working on scaling it up (so more genes can be cloned at a time) and making it easier (so you can press a button and receive a yeast).

Rather than directly replicating the experiment, it would be easier for the team to disseminate their cells to others, who could then grow the cells up, sequence them, and compare the sequence to a wild type yeast to verify the genes were included, then do a few other transcription experiments and blocking assays to show that the genes that got cloned in were actually the ones carrying out the synthesis.