That already sounds OP even if it does not have the same range as the Sturmtiger. But I don't know for sure if it will be more OP than the sturmtiger as all the weaknesses of the sturmtiger don't really matter when you can fire very fast missiles from 45 range through buildings and wiping everything.
Not defending the AVRE here... but if it has short range you can at least retreat, with the sturmtiger it's just like you have activated Soviet windustry without getting the fuel, you just lose 240 manpower every 2 minutes.
I don't defend both. Both are just stupid, and AVRE is even more stupid.
Good for trolling though, definitely not fun playing against them.