You wouldn’t be able to see that debug information on the phone itself if it wasn’t jailbroken, as the GP mentioned you would need to use console on a Mac. The second screenshot is from a phone, ergo, jailbreak.
Also other commenters have mentioned he’s on 15.4.1. That’s two major iOS versions old. It’s possible they’re just on an iPhone 6S/SE/7 which was capped at that version, but a jailbreak is likely.
You talk like a jailbreak is some "dangerous and system-destroying action".
The fact that a jailbreak is even needed to actually get full ownership of your device that's "sold" is laughable. And we have people fighting and demeaning people for demanding the full rights to devices they supposedly own?
Apple fraudulently "sells" rentals as if they were a purchase.
Jailbreaking is a dangerous action... you're running unsupported, privileged software, that inherently takes advantage of an existing flaw in the system. That's not a judgement, I ran jailbroken phones myself for years and years. It's just the facts.
The parent posts didn't seem judgmental of jailbreaking at all.
Also other commenters have mentioned he’s on 15.4.1. That’s two major iOS versions old. It’s possible they’re just on an iPhone 6S/SE/7 which was capped at that version, but a jailbreak is likely.