I just realized that I gave the wrong reference site. Sorry about that.
This is the correct site.
If I understand the situation, unless they added blocking between the roof trusses at the roof sheathing, the fiberglass insulation will slow the movement of the air, but certainly not stop it. Unless the air-sealing has been done, it sounds like the added insulation will have very little effect.
It is not clear what how you fit into this circumstance. If you gave the owner specifications or a recommendation - then use the illustration you linked to and clarify this how the finished product should look. If you were called into advise after the fact you could provide similar advice - this illustration shows the way the air-sealing and insulation should be installed. If you are paying for the work then you should have it done to your satisfaction or withhold some or all payment.
As for the question of attic ventilation: Unless it is a sealed attic (i.e. spray foam) then the building code is looking for ventilation.
I came to the homeowners house to do some painting when the Insulation Contractor was leaving. The access to the attic is in the 2nd floor bedroom closet. I happened to be painting that bedroom so I opened the panel in the back of the closet to look at what was done. You are able to stand up in the attic next to the knee wall so I walked in and saw the insulation secured in between the trusses and tight against the sheating with no baffles. I was a Building Inspector for 10 years prior and new this was wrong. The City where the house is located does not perform insulation inspections so they had no opinion as to if the installation was right or wrong. I also work for the homeowner at a second job so I informed her that she has a problem. The Insulation Contractor offered to remove the Insulation and lay it on the floor of the attic as a good will gesture. I feel as though the Contractor should reimburse the cost of the Insulation and the labor to install it. The roof area is aprox. 400 sq. ft. I truly feel that the Insulation Contractor took advantage of this homeowner and installed something that was not worth the time and money.
Thanks for your response,