You just did sniper OR clowncar. He said sniper AND clown car... That means in one build
If you actually read Serriths post you will find nothing close to him saying that ost is OP. Relax
His post was in response to my own where I stated snipers and clown cars are both counters. I don't understand why, but he interpreted that as meaning you have to build both, whereas my original intent was that one or the other can serve as counter.
I expanded on the concept to clarify what I meant since he interpreted it as a combo instead of an either or thing.
E: Consider if I had said instead : "well ostrupen are countered with t70, t34, t34-85, katyusha, IS2, KV-1, KV-2, KV-8, and ISU". Would you not consider it bizarre if someone had interpreted that as having to simultaneously build 9 different vehicles to counter one unit?