Its running for 15 minutes and then must shut down for a long time to cool down. Thats exactly why those "science-fluencers" said its a dumb idea. This is far away from proving that its a viable idea.
Source for that?
Edit: @kieranmaine thanks! Wonder how long they have to wait to turn them on again.
They use passive cooling in their MVP satellite (for the sake of simplicity, probably). This, naturally, severely limits the heat rejection capacity.