Oh your naivety never ceases to amaze me. UVA/UVB had nothing to do with it. If the ambient temperature were 75 rather than 99 there wouldn't have been a problem, even though the light intensity would have been the same.

Other things you have wrong are that there is UVA and UVB even in the shade outside. The amount is just reduced. In the shade the surface temperature, and therefore a dragon, and the ambient temperature are about the same. In the light, the top surface absorbs heat and increases in temperature. That is why dragons bask, to elevate their body temperature to higher than the ambient temperature.

In this unfortunate case the elevated temperature was just too high.

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