I understand, the appearance may seem confusing although it’s not specific to a theme or standard mode AMP. You’ll notice similar parameters when accessing a non WordPress AMP first site such as https://www.amp.dev from Google search. From there click on an internal link. The Analytics product experts should be able to explain it better if queried using the Analytics Help Center. The additional parameters are normal and in my experience retract after being accessed.
I am not do any setup with AMP linker I just connected Site Kit plugin with my Google Analytics. First time I heard about Amp Linker ( I am fairly new with AMP).
AMP Linker is built into the Analytics module within Site Kit, so users don’t have to implement manually. This blog post explains it better than I could here.
The AMP plugin in analytics section suggest using the Site Kit plugin, so I tried with your plugin.
Great that you used Site Kit, which makes it easier to implement the correct Analytics tracking code on your site without having to manually insert snippets.
I’m not technically on a special level, but shouldn’t AMP only be related to visits from a mobile phone, and not related to visits from a desktop device?
AMP isn’t just for mobile, although you may get most of your AMP traffic on mobile if served from Search Engines, with the Search Engines determining the version of your site to be served (AMP or non AMP).
Let me know if you have any further queries, and thanks for using Site Kit.