Did you know that Pgrens, which are the topic of discussion, aren't in SOV T1?
I'm really not sure if this is supposed to be a joke post.
The fact you suggest that The Clown Car and Sniper can be used as counters to Pgrens suggests that either;
A: The soviet player has gone Tier 1 against Ostheer, which isnt advisable.
B: The Soviet player has backteched to Tier 1 after a Tier 2 opening in order to counter Pgrens. This is even less advisable, and results in the counter being inefficient, and you delaying your T70 significantly. (The extra delay here, particularly if you decide to tech reactively, means the Ostheer player is likely to be able to also get his 222 out and directly counter both the clown car and sniper.)
The argument that these units are "counters" to Pgrens is immaterial, as you simply will not see the units in a normal match vs Ostheer. In a vacuum they do the job, but you will not have access to them, and so this is irrelevant.