Unfortunately that tutorial is out of date due to the transition away from Groovy code. Your best bet for virtual devices is to use this Edge beta driver:
Here is an Edge driver that will enable end-users to create virtual devices that run locally on-hub.
UPDATED JULY 2023…
Features:
Supports the following virtual device types:
A/C, air quality, alarm, Alexa switch, battery, CO2 level, contact, door, energy, fan, garage door, illuminance, Level/dimmer-only, lock, light (including RGBW), momentary button/doorbell,
motion, panic, presence, refrigerator, smoke detector, sound pressure, sound sensor, switch, switch level/dimmer, temp/humidity, TV, thermostat, video camera, water sensor, window shade
Create any number of virtual devices
Easy and fast to use: No coding or CLI required
Enables you to create 100% local automations with virtual devices
See how many devices you’ve created of a given type (inventory)
Devices include additional …
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