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Well, I'd at least expect them to gather a few clues from declassified and readily visible demonstrators like Tacit Blue.  There are several aspects readily observable on that aircraft that would apply here.  I don't necessarily expect the same level of knowledge as other countries but I do expect some basic competency.  The only definitely stealthy feature I see is the configuration of the inlets that would mask the radar signature of the front faces of the engines.  Now, generally flat sides doe not ipso-facto make a design non-stealthy, both Tacit Blue and TSSAM had fairly flat, but angled, sides; the first to house a lpi radar and the second for aero and capacity reasons but there are some other aspects of those that I don't see here.