Sorry, what's the KDE Connect doing? And why is it getting notifications from Amethyst? Are you routing Amethyst's traffic through your desktop?
Nothing wrong with it, I just have never seen that before.
Amethyst autoplays and broadcast everything. I uninstalled KDE Connect from my phone, and from my Linux computer, because it was making my computer go crazy with media notifications as I swiped through Amethyst on my phone.
There's probably a way to get KDE Connect to not do that, but I don't like my phone having the amount of access that KDE Connect gives to my personal computer. I was going to uninstall it anyways.
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KDE Connect is a Linux App for you to interact with your phone while on the laptop/desktop. 
KDE Connect is not just a Linux app. It's available for everything.
With KDE Connect installed, whenever I scroll to a video in Amethyst on my phone, a notification pops up on my Linux desktop giving playback controls.
In the Amethyst video/image feed tab, it's a notification every time you swipe to the next image or video.
KDE Connect is available for everything. Linux, Apple, MS, Android, Linux phones.
Very interesting. I am guessing this happens with the youtube app as well? When you play the video on youtube, does it give you controls on the desktop?
I don't use any Google / YouTube or YouTube apps, so I don't know how they behave.
NewPipe it's an open source YouTube client.
From NewPipe on my phone, when I play a video it doesn't force a notification to my laptop.
Instead, with KDE Connect instalked, and with a video playing in NewPipe, if I choose, I can click the music icon in the laptop's taskbar to dee the playback controls.