Remotely controlled

The dialog in the third screenshot claiming that "Your smartphone is completely locked down due to a flood of spam messages" and telling you to "Unblock it right now using the link" smells to me like a tech support scam.

In those, criminals have not "hacked" your device (although they may have managed to lock up your Web browser). They are just telling lies to make you believe that you have a problem. The actual risk lies in doing whatever it is that the scam message is telling you to do.

FTC - How To Spot, Avoid, and Report Tech Support Scams

Recognize and avoid social engineering schemes including phishing messages, phony support calls, and other scams - Apple Support

The first screenshot does not look to me like evidence of "hacking" or "remote control". It appears to be merely a display of some basic information about the operating systems that are now, or have been, installed in your phone.

iOS has many. of the same underpinnings as macOS – including an operating system core that combines the Mach microkernel (developed at Carnegie Mellon University) with some code from BSD Unix, and some other bits. Apple once released that part of the Mac operating system as an Open Source project called "Darwin" – while keeping all of their added-value graphical interface and development frameworks Closed Source and proprietary.

So it's no surprise to see the name "Darwin" in connection with iOS. Likewise with "xnu". The association of those names with macOS and iOS may not be one that is familiar to end users, but that does not make it nefarious.

It is common for companies who release operating system hardware or firmware to have ways of exactly identifying builds, so that if they get bug reports, they can cross-reference crash logs to source code, and avoid wasting lots of time trying to re-track-down bugs that have already been fixed.