Author here. The table did actually have a primary key, during the migration it was changed to unique, and then the new auto-incremental primary key was added.
I've updated the article to make that part clear.
I agree that having the binlog_format to ROW is the only option that make sense, which thankfully seems to be the default now.
I've updated the article to make that part clear.
I agree that having the binlog_format to ROW is the only option that make sense, which thankfully seems to be the default now.