Paramatma is different from Jiva(s) and is the One who is the controller of srishti, sthithi, laya, niyamana, jnana, ajnana, bandha and moksha.
Bhutakrut: One who created all that exists – hence is the performer of all srishti
Bhutabhrut: One who sustains or nurtures everything – hence he is the lord of sthithi
Rudra: One who detaches us from the bondage called Samsara – hence he is the lord of samhara
Niyama: One who has made the rules for this Universe; One who even controls Mukhyaprana who is the chief controller of living beings – since Vishnu is the controller of the best amongst the Jivas, it goes without saying that he is the controller of all. Hence he is the lord of niyamana.
Veda: One who teaches (all that is there to be learnt) to everyone – vEdayatIti vEdaH – he is therefore the lord of jnAna.
Medhavi: One who controls the medha shakti of all. Medha shakti includes remembrance, knowledge, forgetfullness and other related attributes. As per Krishna himself in the Gita ‘sarvasya chAhaM hrudi sannivishTO mattaH smrutirjnAnamapOhanaM cha’. Hence he is the controller of ajnAna as well.
Mahamaya: One who is the the controller of a Maya known as Shaivali that causes bandhana in samsara. Thus he is the lord of bandhana (and again, ajnAna as well).
Sukhada: One who protects those (whom he has) liberated – sukhAni sukhAtmakAH muktAstAN dayatE rakshatIti sukhadaH. Hence he is the lord of mOksha.
Thus the names of the vishnu sahasranama convey the message that the eight fold activity of srishti, sthithi, samhara, niyamana, jnana, ajnana, bandha and moksha are controlled by Brahma.
Hence the purport of janmAdhyadhikarana is conveyed by the vishnusahasranama.