When I was talking about boiled yuca, I was talking about something alltogether different from yuca frita. Yuca fried like french fried potatoes are a lot like french fries, though generally not as good. So why bother, I say. As suggested, frying raw yuca isn't too tough.
But to get yuca to turn out the way it is served at Papa's Pollo Chon/Cache Sabroso is a trick. The fresh stuff is sometimes trashed, and it's hard to know until you open it. There is a Cuban/Spanish word, which I will remember and get back to you, that specifically describes vegetables such as yuca or avocados, for example, that appear to be ripe and otherwise just fine, but turn out to be chalky, papery, etc. once you get inside. This could come from too early picking, cold storage, who knows, but generally results in the produce going from green to rotten without ever being any good. Yuca seems to have this problem more often than not.
So we almost always go with the frozen. I would not vary from your pressure cooker's instructions. I'd probably place an equal volume of yuca and water in the cooker and let it go for maybe 10 min full blast to soften it up. This should eliminate the chalky core that gives yuca a bad name. Take out the stringy bits, and slow cook in mojo and lots of manteca (lard), stirring every so often, maybe 45 min. If you can do this ahead of time and refrigerate overnight, all the better. Take the yuca, which by now should have most of the fight beaten out of it, and fry in olive oil, lard, butter or whatever you like, with lots of onions and finish with mojo. This is not unlike the next-day frying of pierogi, polenta, risotto, etc. One of the best cooks among my in-laws adds the step of browning finely chopped garlic, shallots and onion in lard and olive oil, and adding the quite hot oil on top of the yuca just before serving. This, I guess, ensures that the onions and garlic will be perfect. Be careful.