I thought the point was that Windows apps will run on Linux under Wine (and macOS?) so using VCL is a cross-platform GUI development environment.

I made the clarification because the comment I replied to mentioned Android, iOS, and macOS. There are many who used Delphi before FMX appeared and I thought it would be helpful to point out that VCL only makes Windows executables.

You might as well use Lazarus and LCL. It'll give the best of all worlds.