The article fees disingenuous, flat panels collect the maximum sunlight from a given area of land and require fewer panels than the arrangement shown. Angling them helps the rain wash them and reduces the amount of mounting brackets unless you’re laying panels flat on the ground. Similarly total KW over the day isn’t why tracking mounts are so common instead it’s the increased value of electricity in the mornings and evenings so the actual economic benefits != total kWh.

However, the bit where it’s talking about increasing the angle means creating gaps between panels or the shadowing is going to offset any gains while also requiring far more panels and more land at which point you might as just angle the panels based on latitude.