crosstrees Think whatever you like.
This:
If you are using Vanadium browser you can go to its notification settings and turn off 'completed downloads'. That should hide notification about the completed downloads.
Other browsers also should have the same.
is a useful answer. Thanks.
This on the other hand
That's not what I'm seeing, it looks like I can disable the notification permission for Download Manager, not that I would recommend touching permissions of system apps, but I'm not seeing what you are in the first place.
is "works on my machine".
I will attempt to troubleshoot using W1zardK1ng 's lead. I'm not going to quit using the OS for one irritating feature. Thanks, W1zardK1ng
Unrelated to the issue at hand, I waited several hours after "works on my machine" response to see if there would be anything else useful forthcoming. Call me snarky if it helps you sleep at night. Hyperbole might've been a poor way to start this out, but I didn't choose violence as my first recourse.