Montreal isn't ignoring aging curves by potentially adding Huberdeau though, they're doing the exact opposite. The reason you do it is because Suzuki, Harris, and Ylonen, will be 23, Caufield and Dach will be 22, Barron, Guhle, and Farrell will be 21, Roy will be 20, and Slafkovsky will be 19 with a year of experience at the start of the 23-24 season. On top of that there will be other players coming when Allen, Dvorak, and potentially Anderson are traded, and with development from the 2018-22 draft classes there could be players who make unexpected improvements as well (and there's guys who currently project as bottom pair/bottom six forwards that could jump a tier to #4D/middle six F tier as well).
The point of adding Huberdeau is that at 30 he's still going to have a lot of game left, and the ages of the young core line up really well with him to be competing when they're all in the 22-25 prime while Huberdeau is still an excellent top-line forward and playmaker (which we also really really need). I also would push back on the idea we've only been rebuilding for one year. The front office only started calling it a rebuild recently, but we've been in a soft rebuild since 2018 and a hard rebuild for 21-22 and 22-23, the rebuild started when we traded Pacioretty for Suzuki and trying to build around Suzuki's timeline while continuing to add players with another high pick in 2023 makes perfect sense to me.