Here's the PowerMEMS Project page from the link you're referring to. Unfortunately, seems like the last update was from 2010. Haven't heard much since. [1][2][3]

[1] Turbine Overview: https://www.powermems.be/gasturbine.html

[2] Turboshaft Setup: https://www.powermems.be/Turboshaft.html

[3] 1,200,000 RPM on Aerodynamic Bearings Test Runs: https://www.powermems.be/Pen_setup.html

There's a little bit further from the author (Tobias Waumans) afterward, yet not much publication [4]

[4] https://scholar.google.com/scholar?hl=en&as_sdt=0%2C13&q=T.+...

Mostly a summary pub on the work on the aerodynamic bearing setup in Journal of Micromechanics and Microengineering [5]

[5] Aerodynamic Bearing (pdf): https://lirias.kuleuven.be/retrieve/160403