Here the word ‘unification’ itself is a misnomer. There is no unification here.
It is only a kind of unison that experiences the union by being separate.
For crores of years in a kalpa one may enjoy it, still it does not become a permanent (*shAshvata*) mokSha – though the originators of that path may claim it to be so.
One day when the saguNa brahman itself is taken into the nirguNa (attributeless) brahman, this whole thing ends and thus this bhakti is useful only to obtain an impermanent mokSha”.