You cannot simply delete the AI features of macOS 27 Golden Gate. The AI features are installed as part of macOS. With Golden Gate, Apple removed the ability to simply toggle off Apple Intelligence, because it is more tightly integrated into macOS.
The Apple Intelligence features on my installation of macOS 27 take up ~35 GB of space.

You can check that on your own Mac in System Settings > General > Storage, and click the (i) next to the space taken by macOS near the bottom.
Note that "System Data" is not Apple Intelligence or the local LLMs, rather they are files that Spotlight cannot assign to a specific category like Documents or Applications. Examples include Outlook attachments, Cloud storage caches, and Time Machine snapshots. System Data will also decrease over the next couple of days as macOS finishes indexing and analyzing your data.
Here are some steps to take to safely free up space:
Free up storage space on Mac - Apple Support
Optimize storage space on your Mac - Apple Support
How to free up ‘System Data’ and other st… - Apple Community
It's good that you're taking a proactive approach to managing your storage. The absolute minimum is ~20-25 GB free space, and as a rule of thumb you should aim to have 15-20% of your total internal storage as free space. Terminology is important here – free space is not the same thing as available space. The one that matters is Free space, but what macOS shows in most places is Available space. Available space includes both free space and ‘purgeable’ space, the latter comprises system caches, snapshots and other data that macOS can delete if it decides more free space is needed. However, there is no way the user can force those data to be purged.
The place to check how much Free space you have is in Disk Utility (in Applications > Utilities), by selecting the main container disk below the drive itself (you may need to select View menu > Show all devices to see it). For example, on my M4 MacBook Pro, the Storage settings pane and Get Info on the internal drive show 1.24 TB of Available space, whereas Disk Utility shows there is 1.15 TB of actual Free space, 90 GB less than ‘available’. Although 90 GB is a small fraction of my 2 TB internal storage, that would not be the case with 256 GB or 512 GB of internal storage.

Note that you can also see the Free space in the System Report (System Settings > General > About > System Report button, at the bottom > Storage).