The professor doing the study claims that they are even 2.6% faster than track spikes.
Alex Hutchinson plots the top 100 marathon times for the past decade and concludes that the recent improvements in times in 2016-2018 "aren’t noticeably bigger than the fluctuations in annual performance in previous years." Also, if it was really just the shoes, there should be a bunch of 2:04 guys running 2:01-2:02 like Eliud Kipchoge.
"Good governance is a matter of unemotional decision making that advantages no particular side, rather elevates the general welfare. As such, just like the exploration to uncover a better competitive mousetrap never ends, so must the sport’s governors continue to maintain a competitive balance where the medal or prize money distinctions are to be found in the common human condition, not in their equipment, or pharmacological advantages much less choices."