No, the user space is (mostly) busybox, in both cases.
The user interface is different sure.
The fact that termux (a Debian userspace) is able to run on android at all is enough to dispel your claims.
Stop with the mental gymnastics, you're ill prepared. If you wish, I can buy you a dictionary.
I suggest to attend one, or search related material freely available.
Termux runs on Android with hacks, and only to the point Google doesn't allow it anymore, unless it is side loaded.
I don't know where you did your degree or when. But my friend you are objectively wrong.
Termux no longer runs because it no longer allows (possibly using Linux capabilities?) subprocesses from around Android 10. Android 12 if memory serves actually starts killing background processes.
No hacks. Unless your degree says using the POSIX fork()/exec() API as "hacks".
Please don't embarrass yourself further. It was quite painful reading your prior response.
Also I they aren't listed as official NDKs APIs, because POSIX isn't part of neither ISO C, nor ISO C++, hence hack.
https://developer.android.com/ndk/guides/stable_apis
A hack that termux folks now suffer from, because it fails Play Store API validation for forking processes, which sidelining works around, until Google decides to forbid that as well.
Coding since 1980's, and only fools are afraid to be embarrassed.
Apple does this too for its more locked down devices.
I've been coding since the 80s too. I had assumed from your hubris and ignorance that you were young. My mistake, it's clear that you're merely an idiot.
Enjoy the weekend, happy in the knowledge that I shall no longer be engaging with you.