Don't display block title on some content types
Do you have Ctools installed? Then you have two visibility plugins for content types. One from Ctools and one from core. Better use that from core, because Ctools is still alpha. If you install the module Block Visibility Groups, then you get the option to negate the condition also for the core plugin.

A core only workaround would be to use the path of the content type and negate this.