This could mean that big changes are coming to OxygenOS, though it’s too early to tell. If it were being discussed internally, OnePlus would not want public relations staff to give a definitive statement on the off chance that the company contradicts them later on. Even if a decision hasn’t been made yet on the fate of OxygenOS, it’s better to stay silent and not give any answer, which is possibly the tactic being employed here. OnePlus already switched its phones to run
Oppo’s ColorOS software in China, so if you are worried that OxygenOS will become more like RealmeUI (which is basically a ColorOS skin), then there’s a chance that could happen here.