Oh, the ones who made the last steam machine

Valve made no Steam Machine before the upcoming one. Are you confused and meant the 3rd party devices that were branded Steam Machines? Those were not by Valve and not by the Half-Life development team in particular.

and controller and supported them for 10 minutes

Steam Controller 1 is still fully supported and got Bluetooth firmware several years after release: store.steampowered.com/…/3931035846865617357