Sri Aurobindo did not discard Karmkand but bypasses it. His starting point is the Vedantic philosophy that there is One Reality behind all appearances. He does accept the reality of the gods but gives them a wider function than what we understand today.
Tatvam asi is the complimentary truth of aham brahmasmi. It means that not only I am Brahman but you too are Brahman. As to Swarg it is a deformation of Swar loka. Swar loka is the plane of intuitive light formed by the sun of Truth. It is in the higher planes of Mind just short of the ultimate Reality. Swarg loka is the peak of the vital world, the paradise of Semitic religions where the souls of the virtuous go. These worlds are within and without, outside as planes of consciousness with beings and energies and forces appropriate to the plane, within as states of consciousness to which we may awaken and enter and in which we may dwell.
Affectionately,
Alok Da