Moody Blues, you have misunderstood.
They mean, by being linked, that if you click on the name link from your App review in the Play Store it will open your Google+ Profile page. That's what they mean.
If you post a review in the play store, it will NOT appear in your Google+ profile.
I know this, because I tested it. Just like I wrote in my first post here.
Anyone here can test it. Post a review, then go to Google+ and see if it shows up.
Yes, reviews are linked to Google+.
No, they do not appear on Google+.
If you never post anything on Google+, people who click on your name from the app review link will not see anything!
That fact that the G+ account exists does not force you to use it.
The ONLY difference between now, and previous to this change, is that it will now use the name that is linked to your GOOGLE account... NOT to your Google+ account, but your GOOGLE account (ie. Gmail) because that is where Google+ will get the name... from your Gmail account.