Super cool concept. Should be a slick solution to some ugly problems. But, I don't see any way to set the behavior of the hidden stops in response to circuits? Is that supported? Is there some other way to use these things? That's the only way I've imagined so far. For example to set the train limit on a hidden stop ( or enable/disable it) whenever its items are needed. How is that supposed to be done? Only the visible stop shows any settings for the circuit connection. The hidden stops never do.
2.0.77 here with space age turned on.

The hidden train stops are actually connected (at least in the latest version). The GUI of the train stops just doesn't show it.

If you unzip the mod, open data.lua and add these 3 lines:

draw_circuit_wires = false,
circuit_wire_max_distance = 9,
circuit_connector = circuit_connector_definitions["train-stop"],

to the invisible-train-stop definition then the circuit connection box will show when you select one of the extra Stops of the train stop.