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UVA passes through the atmosphere without losing much intensity, so per quote one it's intensity doesn't change, nor does it's magnitude as a percentage of total insolation vary, much, during the year (and what variance there is happens at source). Total ground level insolation intensity in $Wm^{-2}$ does change with latitude and seasonal angle of incidence ...

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Reddit user and r/EarthScience mod Halcyon3k pointed me to the following visualization that nicely illustrates Ash's great answer on the fact that "total ground level insolation intensity in $Wm^{-2}$ does change with latitude and seasonal angle of incidence": (image source) Halcyon3k's explanation: Solar energy is measured in watts per square ...

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