They really went cold well before the playoffs. In September they were 12th in the NL in runs scored while they took their time trying to wrap up the division. So, basically they had two terrible offensive months to start the season (12th in NL at the time of the Adames trade), followed by 3 good months and capped off by another poor month.. Some of that was affected by various injuries, but there were also several regulars who floundered to the wire and that continued in the Braves series.
A significant part of the concern coming into this season is whether players like Adames, Urias, and Narvaez will contribute as much offensively as they did in 2021 and whether Renfroe can replace Garcia's production. It's certainly reasonable to question whether Adames can repeat the .365/.521/.886 he produced after joining the Brewers. And Urias getting injured and essentially missing all of the spring games doesn't help either.
Recognizing that the season is still in its pre-embryonic stages, any concerns about the offense certainly haven't been alleviated by the early season woes against some pretty mediocre pitchers.