FTA: " This doesn't mean that every incoming email should now be checked and processed individually by a Google employee, the court said. But the company has to provide the possibility for users to contact it via email, it said. It was left up to Google how to deal with future incoming email."
So it seems to me that the court is not saying every customer email has to be individually checked. Maybe it would be sufficient for someone to have responsibility to look at a sampling of emails to that mailbox, that would satisfy the "possibility" of users contacting Google that way.
"If Google does not change its conduct, it could be fined up to €250,000 about US$323,000), the court said."
Alternatively since that fine is so small in Google terms, if it's a one-off, maybe they should just pay it and carry on. I wonder how long it would take for further action to result if they did that.