I think he shouldn't have made the war factory. A naval yard seems more fitting since one could get those Assault Destroyers to support the infantry pushes. They're quite useful against Tsunamis and are perfect to harass walled-in refineries. Just drive over the wall and crush that silly collector. You can also set it to patrol in front of the Mecha Bay to crush everything on the spot. A dog pack could take care of the barracks.
Still, if he did go for the war factory, then why no guardians and their lasers? That would massively improve the odds for his Javelins. The riptides were a mistake.
Common after he third time loose all infantry in this narrow choke point to tsunami charge i really wanted to quit watching.
He should really use his vindicator to harass your eco as you didn't have tengus so he could fly freely. I am not air generals so i don't know how many vinds boms is needed to ko harvester but...