Samsung Galaxy Note 4, Marshmellow update, S-Pen

I understand that the new Samsung Galaxy Note 4 can be updated to Android Marshmellow. I also understand that the S-Pen can now take notes with the screen off while the phone is locked. After watching many videos on YouTube, it appears that once a screen message is written on the phone, if the user saves the message it automatically unlocks the phone. Is that the case that someone can bypass the unlock code by simply writing a message and saving it? Thanks so much

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