Is this peterson roll / turtle-variant video legit?

[yetanother]

Found this video on youtube and I'm wondering if the way he sets up the turtle with knee torque position legit?
I have some cool stuff (from Telles as well as thing I sort of "invented"/adapted from dogfight moves myself from there) and would love to get the hook from turtle.
Also are there other ways of getting the hook or any good videos with peterson roll or sit out (if the setup is legit) details?

 

[number9dream]

His credentials appear to be correct at least:
http://sharksmma.org/coaches/
http://thecaliforniawrestler.com/history-of-cal-poly-slo-wrestling/

Div 1 All American sounds pretty legitimate.

 

[Invisible Jiu Jitsu]

try a little morceplata too:

 

[Invisible Jiu Jitsu]

my granby and peterson for bjj style guard defence playlist: