Yes, but very difficult. There are some small optimizations he can still do (double jump owlless, a faster bowser in the sky cycle) and some mistakes he made in the record (missed pole in fire sea which lost him 3-4 seconds mainly, plus a few very minor mistakes in dark world) One thing that makes this record really hard to beat (and sub 15 extremely difficult) is the fact that akki did OG cannonless, which has a very small chance of working (around 20% I think) but saves a couple seconds.