I don't understand why you think that automating pressing "1" does anything useful whatsoever, based on my explanation of how the feature has changed, and how it now works.
Now, when Google Voice's call screening is enabled, ALL inbound calls are screened, and ALL inbound calls will ring on your phone, and ALL inbound calls will present (speak to you) either a stored contact name or whatever the caller says or doesn't say. It doesn't matter whether your aunt Betty or a heinous scammer is calling; their call will still ring the OBi-attached telephone. If you press "1", either manually, or automatically, you will be talking to Aunt Betty or to the scammer. If the OBi device "pressed 1" for you, then you wouldn't even hear the information about who's calling.
So, no; you didn't understand how call screening works now.
