Awfully skeptical of that claim. While there is more friction area potentially, skin is very easy to damage when "pruned". You can't use any significant force in this condition making normal skin with higher force capability much more useful in water.
"In the latest study, participants picked up wet or dry objects including marbles of different sizes with normal hands or with fingers wrinkled after soaking in warm water for 30 minutes. The subjects were faster at picking up wet marbles with wrinkled fingers than with dry ones, but wrinkles made no difference for moving dry objects. The results are published today in Biology Letters"
https://www.nature.com/news/science-gets-a-grip-on-wrinkly-f...