I decided not to install Feb SSU, for the time being. A "uninstallable" MS update may be a potential source of further not predictable issues, by its very nature. But it is only my own opinion. Awaiting further March updates...
He can just enter the kb number in the searchbox on the "Installed updates" window. And no need to uninstall anything if the bypass installed KB4528069, all is ok then. And another thing, he ran the offline installer, that is for offline integrating it in a mounted wim.