Будда погрузился в джханны потому что пробудился или пробудился потому что прошел по джханнам?

Right view, right thought, right speech, right action, right livelihood, right effort, and right mindfulness.
Sammādiṭṭhi sammāsaṅkappo sammāvācā sammākammanto sammāājīvo sammāvāyāmo sammāsati.

Unification of mind with these seven factors as prerequisites is called noble right immersion ‘with its vital conditions’ and ‘with its prerequisites’.
Yā kho, bho, imehi sattahaṅgehi cittassa ekaggatā parikkhatā, ayaṁ vuccati, bho, ariyo sammāsamādhi saupaniso itipi saparikkhāro itipi.

https://suttacentral.net/dn18/en/sujato?layout=linebyline&reference=none¬es=sidenotes&highlight=undefined&script=latin

Sammāsamādhi - unification of mind (сittassa ekaggatā) with the seven factors as prerequisites.