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> the absence of mechanical parts needing lubrication means the generator could exceed a decade of lifespan

This is something specific to their design, as far as I could Google Sterling Engines requires lubrication in general.

Normally all thermoacoustic Stirling engines do not need lubrication, which is one of their main advantages, because they do not have a piston of traditional form, but they have something similar to the membrane of a loudspeaker or, better said, like the membrane of an electrodynamic microphone, which oscillates back and forth, moved by the gas, and the movement induces electric currents in a coil, either a stationary coil or a moving coil attached to the oscillating membrane.

The traditional Stirling engines have pistons that move in cylinders, so they need seals and lubrication (though there are designs with dry gas seals, which do not have lubrication with oil).

It's kind of a weird claim. If it doesn't need lubrication then it should last forever without maintenance. If it's a sealed system using a lubricant that lasts a decade or so, then maybe it'd make sense. Otherwise it sounds like whispers.

Thermoacoustic Sterling engines don't need lubrication because they don't have pistons:

https://youtu.be/abswNCqnMRQ?si=jYIZnUG83ZQnQ-Ru

The membrane may eventually need replacing though.

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