But the period of the audit was 2019-2022. Before 2022 it was the case that US ETFs were taxed under CGT. It's not clear from the post what disposals there were in 2022 that would fall under the new ambiguous guidance.
Why would there need to be disposals?
As we know, US ETFs must distribute dividends.
It therefore follows that there must have been dividends paid in 2022 post the change in the Revenue guidance.
These dividends must have been recorded in 2022 under general tax principles (income tax) and Revenue accepted the filing as submitted.
Therefore these US ETFs were accepted as taxed under general tax principles and not gross roll up.
QED