AN9.47 describes the topic of a directly visible Nibbana, i saw.
The sutta explains that Nibbana is seen in a provisional sense (according translation Bodhi) while one is abiding in jhana, in all of them. And Nibbana is directly seen in a non-provisional sense when asava’s end completely, for example, after experiencing sannavedayitanirodha.
I think this support the idea that ‘directly seeing Nibbana’ refers to experiencing the cooling down of the mind due to the temporary or definitive cessation of defilements.
But sometimes it seems Nibbana is something completely different as in Udana 8.1, a sphere where there is no this word or other world, where the big elements cannot establish themselves etc.
This is find confusing.