Indeed, one should.
I said he cultures epithelial and mesenchymal stem cells.
You believe that it's all fine and dandy because he "cultured DP cells" or whatever, but that's only half the puzzle: They need to culture the epithelial cells.
"For applications of our technology, both mesenchymal stem cells and epithelial stem cells, which are applicable to human clinical applications, are needed. With respect to the development of the technology to cultivate mesenchymal stem cells, that is papilla cells, being applicable to human clinical trials, we are already in progress now for development. On the other hand, as for the technology to cultivate epithelial stem cells of follicles, it still remains a significant challenge globally."
Until Tsuji's cultivation of these cells is proven to work with human cells, it's still roadblocked like the ones that came before it.
He probably will achieve this, but you can suck a dick regardless.