OST hard in 1v1? What drugs are you on? You have a couple of different builds, all work wonders. Generally you play around the MG42, and given the massive arc, you won't spend a lot of time repositioning it. OKW is "harder" to play in 1v1 because you have to make a choice in teching, but other than that, they are completely fine. Never seen an OKW player that struggled against any allied faction in 1v1. They dominate USF the most, soviets the least.
The game overall is decently balanced considering you have to have a "one fits all" solution across all modes.
I assume he meant the general tendency of Axis being worse in 1v1 and better in 4v4 than Allies, which is also backed up by the stats we have.
https://coh2stats.com/stats?range=range&statsSource=top200&type=1v1&race=wermacht&fromTimeStamp=1630454400&toTimeStamp=1643673600
Now it depends what we understand when saying "hard to play": Balance wise weak or just harder to get a grasp on. But in the end when looking at top players, both will translate into a diminished win rate. USF seems to play out similarly vs both Axis factions regarding the chance to win. OKW seems a bit weaker vs Soviets and stronger vs Brits. But in the end, it all closely mirrors what we see in the general statistic: Axis in 1v1 have slightly below 50% win rate. There do not seem to be larger differences which Axis faction you play against. The main difference basically comes down to the question if you play Brits or not. If yes, your win chance is about 48%, if not, it is 52%.