Jolt, the tire article wasn't talking about underinflated tires.
None of those tires were down to 35 lbs of pressure!
When tires are as low as yours were, there is a LOT of resistance.

I have tires that had directions right on the package for how many pounds of pressure per pounds of
weight of the rider. It took me months of trying to convince DH to leave my tires at 90 instead of blowing them up to 120 which is the max.
Did you notice the other thing in the article? the faster tires were not the 23cm ones; they were the 28 cm ones!

and Karen, right on. Ride your own ride. But don't make it harder on yourself with squishy tires.