Did Peking U. Just Make the World's Fastest Transistor - Without Using Silicon?

"It is the fastest, most efficient transistor ever," proclaims an announcment from Peking University. "And most important of all, there's no trace of silicon involved," adds ZME Science.
From the South China Morning Post:
A team of researchers at Peking University claims to have shattered chip performance limits and proven that China can use new materials to "change lanes" in the semiconductor race by circumventing silicon-based roadblocks entirely.The researchers, led by physical chemistry prof