There wasn't a lot of usage on this before Google made their changes so it has been quite low on my priority list. However I can pick it up again if you're interested in using it.
As a workaround, you can probably achieve this with IFTTT. Create a new applet with Google Assistant as the IF THIS component. You can set a command to trigger the applet. Then, in the THEN THAT component use the webhook service to trigger a Sequematic sequence.
In the meantime I can resume work on the Google Assistant service but it will be a few weeks before it's available to use.