Ringlights renders a very specific type of illumination. If you unbalance these, the "ring light effect" is gone.

That is why people use it in dark environments.

They are usually not that bright because they are pointed directly at people's eyes and normally for close illumination.

The specific light you mention is a video light so it is continuous light, and it is for close-ups, like for makeup artists. I doubt will help you in a "fashion photo shoot" but you need to look at the specs.

A continuous light makes part of the overall ambient light.

If you want to somehow overpower the ambient light you need to use a flash.

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I am a little worried here because it seems you have not a clear idea of what you want.

Do you want to reduce contrast in a low contrast illumination? Will it help to reduce an already reduced contrast illumination? yes to some degree.

But depends on the aperture speed, distance, weather conditions distance to the background, aperture.

You need to clarify if what you want is to get a specific "style" or you just want to "reduce" shadows.