Yes, the goal is almost that but with some changes. In this version of the deck you
Dread Return your
Underworld Cerberus and then sacrifice it flashbacking
Cabal Therapy. It dies and trigger his ability returning all creatures to your hand, so now you have some
Elvish Spirit Guide (and Simian), one
Wild Cantor,
Laboratory Maniac and
Street Wraith in hand. You add mana with the Spirit Guide, use
Wild Cantor to filter to blue, cast
Laboratory Maniac and win on the spot by drawing with
Street Wraith.
Summoner's Pact is one of the mana accelerator because you can grab the
Elvish Spirit Guide. However you can grab the
Wild Cantor if you don't have Black mana sources. If you use
Summoner's Pact be sure to win the turn you cast it (usually the first turn).
Bridge from Below is there because sometimes you draw some
Narcomoeba and if you draw 2 of them, it's difficult to combo out with
Undercity Informer. But with Bridges (1 or 2) you can Flashback
Cabal Therapy and not lose any creature (to cast
Dread Return) or effectively netting you a creature if you have 2 Bridges, so you can combo out with only 2
Narcomoeba.
Regarding your list, i think that
Lotus Bloom is a very bad card for this deck. It is a mana accelerator but not of the kind we want it! We need fast mana to win the very first turn of the game, because we have no interaction with others decks and if we wait to win we can encounter graveyard hate or counters. So our goal is to win our very first turn of the game (on the draw it's very easy), i would cut the
Lotus Bloom for other mana ramp like
Rite of Flame or
Seething Song (although we need Black mana).