I imagine so, though I’m not sure I’ve ever actually used Uncle Ben’s! Checking online I see UB is ‘converted’ and ‘enriched’, but I presume that’s not related to the parboiling and cooking method.
My usual method is similar: bring to boil, simmer until liquid is fully absorbed, likely as you say about 20m or whenever I remember about it. 
I normally reckon 2x liquid with basmati, and a little more for American-style LG rice, say about 2 1/4 x.
This stuff does have cooking instructions – but only for the ‘boil it in a ton of water like pasta’ method. Hence my wondering if that was for some bizarre the only method that’d work with it.
Just tried again, somewhat better results this time. Maybe slightly over-steered on the amount of water, but still seemed to need a lot of cooking time. Most odd.
