If the Army tests really proved that the traction was insufficient, why didn't they just redesign the wheels with, say, spikes?
They did look at using spikes, why they didn't go with them is anyones guess, perhaps they didn't look good enough, perhaps they would raise too many questions about traction on the moon and why the astronauts don't need crampons.
When it's all a sham they can choose style over substance, and lets be honest, the rover tyres make no sense at all, they are an absolute triumph of style over substance.
They have a mesh which is supposed to be the frictive surface, then they cover 50% of it with a smooth chevron, the chevron is thin so provides no notable tread, it is smooth so provides limited traction, it covers 50% of the mesh and recesses the other 50%
Worlds dumbest tyre design ever.
Well, that's pretty much the bottom line, isn't it? If the test had determined that the tire/weight/motor combination was not able to meet the desired parameters, they would have gone back to the drawing board and made changes until they had a combination that worked.
It may be impossible to make a vehicle with weight restrictions that would work on the moon, also they didn't have time for delays, also IT WAS ALL A SHAM, so why not go with a cool looking design they can hoon around in rather than something clumsy looking like a tracked vehicle?
Or, at least, if we assume for a moment it was faked, why would they run tests that would prove the fake wouldn't work, leave them in the public domain, and not make at least cosmetic changes that would look like they had addressed the issue?
These are army tests, they were told to test the wheels with the expected weight the would have on the moon, in a simulated lunar soil, and that is what they did. Simple as that.
It is entirely possible that they did not consider the implications of 1/6g above and beyond the weight difference at all, especially as it was not in their brief to go beyond testing the wheel/soil interaction.