Have you read 13 point in that blog post ? Please find below:
13. If I run two businesses from the same address, could I simply add a suite number to differentiate?
Yes, but you'll also need to have different phone numbers for each business, even if it's just a forwarding number. Google uses phone number as their unique identifier for the business so they will merge businesses with the same phone number and assume it's a data error instead of two separate businesses. I have seen this happen with clients in the past, and it just can't be fixed without two different phone numbers.