The oracle problem is certainly there and does not have a very clear solution. Right now augur is probably the best we have, which has some serious flaws, but this is still very experimental and a lot of progress will come in the next years.

In any case, the problem has been simplified. Instead of discussing about climate change (which is hard) we can now discuss about measuring temperatures (which is easy). Cheating on the easy part is much harder and there should no longer be any idealogical battles on how to do this.

Truth can be absolute on objective questions. If we ask what will the temperature be tomorrow at 12 in a given place, there is exactly one correct answer. Of course on subjective questions there is no answer. This is like asking what is better pasta or pizza.