I emailed Graphisoft Support about this topic earlier this morning. Here's the reply that I received. I hope this helps! - Jeff
This should be no problem. Archicad has not supported the Quicktime file format for a number of versions now. Were you to try to install an older version of Archicad, say Archicad 15, you might be asked to install Quicktime, but the current version should be fine.
iMac 27 (2020) 3.8 GHz Core i7; 128 GB RAM; Radeon Pro 5700 XT 16 GB GPU (macOS Sequoia)
MacBook Pro M1 Max; 64 GB RAM; 32-Core GPU (macOS Sequoia)
ArchiCAD 28/27/26/25 Full (back when Full used to mean Full) (latest builds). User since AC12 (2008).