Yes, clearly in that phrase I stated that there is no difference in run environment, and that all pitchers will put up identical ERA numbers after changing leagues.
Also, that comment was in response to this:
It was tongue in cheek. Since you appear to be too stupid to discern obvious sarcasm, I'll be sure to dumb things down for you in the future.
E: oops, silly me. Breaking my own rules already. My first sentence was not a phrase a normal person takes at face value due to the obvious indications of sarcasm.