It will allow the widevine-helper add-on to download a 7MB libwidevinecdm.so file from Pi Foundation servers instead of having to download a 1.7GB ChromeOS update to unpack and extract the file, which is a nice improvement to user experience. It will make no difference to how widevine using streaming services operate, i.e. the formats or resolutions that can be used for media playback - there are no changes to widevine certification status.