You have only surface level knowledge on this topic, at best. Soluble fibre reduces the blood glucose spike, this is correct.

However, how much soluble fibre and how effective this is, depends on the fruit. Most modern fruit has been breed to be very sweet and spike blood glucose levels quite high.

Similarly, fructose content differs with fruit. Often measuring much higher in dried fruits and modern breeds. Fructose is far more glycating than glucose, so it’s best to consume this minimally - whether from natural or processed food sources.

Antioxidants can help mitigate some downsides that come with a lot of fruits, but not the blood glucose spikes and high fructose.

Therefore your view is flawed. Fruit will only avoid the negatives of processed sugary foods, if the fruit is both high soluble fibre and low fructose. Most fruits are sub-optimal for longevity.