@hoogagroup from project description:
"Software
Copy and rename secrets.yaml.example to secrets.yaml and update it with your WiFi credentials (wifi_ssid and wifi_password).
Build the image with ESPHome
make compile
Upload/flash the firmware to the board.
make upload
By default the project builds for the AtomS3 board. To change your board, you can specify the BOARD parameter. For example for the Olimex ESP32-EVB:
make compile BOARD=esp32-evb
make upload BOARD=esp32-evb
Now when you go to the Home Assistant “Integrations” screen (under “Configuration” panel), you should see the ESPHome device show up in the discovered section (although this can take up to 5 minutes). Alternatively, you can manually add the device by clicking “CONFIGURE” on the ESPHome integration and entering “<NODE_NAME>.local” as the host."
so you need to see ESPHome for it.