Are you freaking blind? He have mg icon in upper corner since he already teched to t1. facepalm. And with mg they are squad up vs con spam. If jove would have a sniper or mg then OH would have minimun extra 1-1.5 squad.
No matter what oh build they always have numbers advantage esp. vs player who is rushing to T3 due to low cost of teching and starting mp buff.
I know you don't play this game anymore, but you haven't had to tech up to get mgs in months. I can see on the minimap he hasn't teched up.
No, they won't have the advantage in squads. The only way they would is if they made a bunch of cheaper units like Osttruppen or pioneers, which is what happened in your example.