Not the other poster, but the find/replace on the “command” inside the project “compileCommands_[my proj].json” worked for me on Ubuntu / VSCode, and has (so far) removed the intellisense error on the “:” that the screenshot shows at the top.
Then the cpp class intellisense (error: “no instance of overloaded function XYZ matches the specified type”) was fixed by doing the same to the Unreal Engine “compileCommands_[my proj].json”.
I first experienced the issue with include “CoreMinimal.h” being underlined in red, but this one was solved by refreshing the VScode project after having created the new h/cpp class, as suggested at the top of this link: Removing red squiggles (Intellisense errors) for Unreal Engine · GitHub.
So thanks to all of those who participated in that thread - intellisense is now functional.