Ah, but surely the point of Heaven is that it is a place you go, rather than a separate place you exist in. In other words, in Heaven, you still have the perspective of having been on Earth, and thus "evil" still exists for you in comparative terms.
Only if Heaven was a completely separate world where the inhabitants had no prior knowledge of "less perfect" worlds (i.e. ours), would it be the "debunking" of the problem of evil as you say.
Only if Heaven was a completely separate world where the inhabitants had no prior knowledge of "less perfect" worlds (i.e. ours), would it be the "debunking" of the problem of evil as you say.