The Canes main focus was Meier. When he was traded, pretty much all of the good/top 6 available forwards (that weren't over priced players like say Hayes), were gone. I would've even been happy with Nino returning to us after Meier was gone, but Nino was traded to Winnipeg shortly before Meier. Also, Carolina isn't typically a team that trades for rentals.
It's also not like the Canes didn't try to trade for other good players before Meier this past deadline. Carolina was interested in Horvat, but Vancouver wanted a higher draft pick, and that priority meant Carolina wasn't gonna get Horvat. They weren't gonna trade Necas who Vancouver asked for (LOL).
It kind of seems a certain Blues fan might be pissed off we didn't trade for one of their players, and is twisting the sequence of events for a narrative. FWIW, I think Carolina was interested in ROR, but Toronto went truly all in with this year's deadline with multiple players (their GM's job is on the line, so many 1st round exits, etc.), and it's hard to beat a treasure trove for a rental; a guy in his 30s with a recent injury and sluggish season no less.