I am not sure. I think it’s hard to tell if that would happen. A lot of low carb and keto processed foods on the market today are normally very high fibre and are more convenient to consume than making low carb meals at home which would have a reduction of fibre in comparison.
However, I personally cannot eat fibrous foods. I’ve had to cut that completely out as a result of the damage fibre has done to my bowels after years “healthy” eating.
I am not alone in this either as there was even a clinical trial that studied the effects of fibre on patients with idiopathic constipation and the results were highly statistically significant in that it showed causation between the consumption of fibre and increased risk of bowel related illnesses. This is not an epidemiological study either that only shows correlation! https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3435786/