Gasperini built up a very attacking Atalanta but in his two first matches with AS Roma, he won minimally with them. This means either he has changed his tactics - that I don't believe he changed, or AS Roma does not have enough good attacking players to play so attacking and score many goals. Another possibility is those players need more time to absorb the tactical philosophy of Gasperini for playing more goal productive.
Scudetto is a very ambitious target and if Napoli could win it last season with Conte, AS Roma can win it this season with Gasperini. Yes, they can but there are many matches till the season ending and AS Roma must work very hard to get Scudetto. If they want to win Scudetto, they must start to think of it now, work for it now as in Scudetto competition, any point drops can decide the title winner.
Gasperini first two wins with AS Roma were small which is different from his usual attacking style. This is probably because AS Roma players are not right fit for his style or they just need more time to learn his complex tactics. Winning Scudetto is difficult goal and it is possible since Napoli did it last season AS Roma must start working hard now because every point they lose could cost them title.