>Remotely hosted code, or RHC, is what the Chrome Web Store calls anything that is executed by the browser that is loaded from someplace other than the extension's own files. Things like JavaScript and WASM. It does not include data or things like JSON or CSS.
If I recalled it correctly, Chrome's developers imposed a stricter limit on dynamically loaded (fetched) DNR rules. That's why updating rules with the store is the more conventional method.