AU is not a common term in IT. But when used, is typically used to signify the "Anniversary Update" as I noted above. Google it and see for yourself - or click on that. And in any case, AU for automatic update would be an all inclusive term for any program that has an auto-updater feature - which includes most programs.
WU, on the other hand is commonly used in forums for the Windows update program called, oddly enough "Windows Update", not automatic update.
I don't have this trouble anywhere else.
Sorry to be so disappointing. But I am not going to assume you know what you are talking about, or that I understand you when say so many things that are inaccurate not clear or just not true. For example, Chrome certainly does work with W10 and was not broken by the "AU" (anniversary update).
One of Cortana's main features is it is voice activated so it certainly is not deaf. Chrome on the other hand, is not voice activated unless you install an add-on. And of course, IE is still supported by MS and is included in W10.
And these updates don't lay in a dormant (latent) state though they may not be pushed out all at once to avoid swamping the Internet. It is not uncommon for updates to take days to be delivered to everyone - especially to computers that are turned off when not in use.