The short answer
Yes. Rebuilt or re-downloaded automatically when needed.
What is it?
Xcode playgrounds that use iOS or other simulated platforms run on their own simulator devices, kept in ~/Library/Developer/XCPGDevices. Old devices for SDKs you no longer have installed often stay behind.
What happens if you delete it?
Xcode creates a new playground simulator the next time a playground needs one. Your playground files are stored elsewhere and are not affected.
How to remove it properly
Quit Xcode, then move ~/Library/Developer/XCPGDevices to the Trash using Finder’s Go › Go to Folder….
Quit the app that uses it, then move it to the Trash. Empty the Trash when you’re sure.
How MoreRoom helps
MoreRoom recognises this item, shows its real size and when it was last used, and labels it “Safe to remove”. In the free version you can move it to the Trash in one click, with Undo; Pro collects every safe item at once.
Frequently asked questions
Is it safe to delete Xcode’s XCPGDevices folder?
Yes. Rebuilt or re-downloaded automatically when needed. Xcode creates a new playground simulator the next time a playground needs one. Your playground files are stored elsewhere and are not affected.
Will Playground simulators come back after I delete it?
Yes. Xcode creates a new playground simulator the next time a playground needs one. Your playground files are stored elsewhere and are not affected.
How do I remove Playground simulators properly?
Quit Xcode, then move ~/Library/Developer/XCPGDevices to the Trash using Finder’s Go › Go to Folder….