Maybe? Like, the shoes are certainly a contribution factor, but you're basically talking about stacking multiple 0.1 percenters at that point, which one tipped things over the line is hard to say, and you obviously have to account for the fact that Kipchoge is a genetic freak (like all top athletes) with a couple decades of consistent training behind him and a team hell-bent on finding all incremental gains they can. That period also saw significant improvements in fuelling strategy, amongst other things.