The article literally proposes and refutes that hypothesis. No, the longer answer is that:
1: The Voyager shots featuring a featureless orb were shot near the Uranian solstice, so each hemisphere was getting nearly constant illumination (Uranus is tilted on its side). If you look at it now nearer the equinox (where it has a day/night cycle) you see storms and clouds. And...
2: The cloud patterns are always there anyway, they are just hidden by a methane fog that blocks visible light during the solstice. The heating/cooling cycles of the midyear break up this haze and it looks more transparent.
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The article literally proposes and refutes that hypothesis. No, the longer answer is that:
1: The Voyager shots featuring a featureless orb were shot near the Uranian solstice, so each hemisphere was getting nearly constant illumination (Uranus is tilted on its side). If you look at it now nearer the equinox (where it has a day/night cycle) you see storms and clouds. And...
2: The cloud patterns are always there anyway, they are just hidden by a methane fog that blocks visible light during the solstice. The heating/cooling cycles of the midyear break up this haze and it looks more transparent.