How can they even say that when fact is that Microsoft Windows 10 is not safe at all.
It does not matter who your private data ends up with and everything you do is reported back to Microsoft in great detail unless you strive to make it not to. In this respect, telling that Windows 10 is a secure OS is nothing but a lie.
They should make sure that the users regains control of their own data first and without sending most if not all to their own servers.
After that they may start to mentioning safety. As long as the operating system sends personal data out on the net, how can they even say it is safe? It is nothing but a ticking bomb waiting for the next malware to reroute the information using Microsoft's telemetry components to do the work for them. Why not, they do not even have to know how to program properly as a little patching is all there is to it.
With that being said... How secure is Windows 10?