Deep POV? What's that?

My editor sent me back my YA novel manuscript (Tangi's Teardrops) two weeks ago. Most of the comments that decorated the manuscript were, "Narrative telling. rewrite in deep POV".
I've heard about writing in deep POV before and I also know that it's not one of the easiest skills to master.
On the other hand, many writers write in deep POV without even knowing it. Even me. In my contemporary romance novel, I nailed it--according to my editor at least--but I never really thought about it while writing. Until now.

Well, I'm rewriting the whole YA manuscript at the moment and learning with every page. I have to admit, my novel is becoming more alive.

For those of you who are confused about Deep POV, here are a few links I found to be helpful (including quotes to whet your appetites):

PART FOUR-Deep POV
"A skill that leads straight into strong, emotive writing is Deep Point Of View. And I mean deep. This is often a very hard skill to conquer, but it's so effective I felt it needed a whole day's work." (WOW; Women On Writing)

Deep POV
"Another term for “Deep POV” is limited Third Person. It’s a technique that infuses Third Person POV with the intimacy of First Person" (Maeve Maddox)

5 Tips For Writing Deep POV
“What is the key to spellbinding, page-turning writing? Emotional connection between your readers and your characters! Whether you’re writing fiction or nonfiction, learning the secrets of deep POV will make your writing come alive in the hearts of your readers.” (Simon Presland)

How Deep POV Helped Me Achieve Publication by Pamela S. Meyers

"I had never heard of Deep POV, but I sure did learn about it in a hurry. As I added it to the story I was amazed at how much richer my story read." 

Go Deep! Eliminate Distancing Phrases for Deep POV
"One of her tips you see a lot: eliminate distancing phrases like ‘he said’, ‘he heard’, etc. This is almost always covered in any blog post on Deep POV."