No man. We cannot conclude that volte bodies are unaffected by TH because it can appear in any drop/treasure slot (except for Offering).
The same is true for other volte pieces. Excluding drop slots with a dedicated non-volte item, we can not discount or observe otherwise that TH made a volte item appear, so we have to conclude inversely that TH can affect the volte drop rate.
If that were the case we'd have a screenshot of multiple hauberts, but we don't.
We're talking about a 1% drop appearing twice in a pool, 1/10,000 chance. We know that's not possible. But TH can increase the drop rate of volte and it still be a once per pool item. Wave 2 bosses can even drop a different version of pools that indexes by hash-ring, with different percentile probabilities, too. If we can't measure or observe, we can't arrive at a conclusion. So, keep spamming TH