I assume it has something to do with architectures and it being somewhat of a glorified raspberry but yeah, weird times we live in.
The author of Drastic wrote a non commercial version for Rasp Pis and Odroids. PS Classic is using a the hacked odroid version of the emulator. Hacked as in, afair it needs one library, that doesnt come with the PS Classic, and people found a way to preload that - and get the Odroid binary to work.
There are severe limitations though. The version thats released for the Pi and Odroid is an older version of Drastic that doesnt feature shaders, oder screen rotation.
No shaders means - not even simple 2x nearest neighbor scaling (for 2D content, for 3D content it has a 'hires' mode), so fullscreen on a big tv looks crappy as can be (bilinear artefacts, washed out edges).
No screen rotation means, that games like Hotel Dusk that required you to hold the DS like a book - are unplayable.
Updates - or fixes are unlikely, as the Drastic author has chosen to make it a commercial product - and anything that he has done aside that - is likely to show goodwill to people in the coding community (hence Rasp Pi and Odroid - which are entry level "learn coding" hubs).
Its use is limited - but its something (if you can cope with having two screens horizontally on screen for the PS Classic, and scaling gets bareable, because those simply are smaller, ...).
Probably could be done somehow on the Switch as well (similar architecture), but a real Horizon based emulator that is worked on or even the Android version of Drastic (paid, newer) should be preferable. Because they would do - what you want them to do.
Of course youtuber is too youtuber to mention any of that.
Short version - its not open source. That it works is a hack. And there are tradeoffs, that you don't really want.
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That it runs in retroarch is a hack as well - genderbent (dev of RetroBoot for the PS Classic), just wrote a retroarch core that launches the standalone emulator binary with a game preloaded. Its not a real Retroarch core - its just a "linker".
Youtuber of course is too youtuber to mention that as well.
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Also youtuber urges you to "join his facebook group", because "there are lot of people in there that will help you" - and "as long as you are civil and courteous - you will have no issues getting help".
And thats - btw, what we need to prevent at all cost in any community thats knowledge based.
Because social game - more often than not - goes like that.
Moron Dudebro - with a talent to be center stage with a bullshit personality and half a brain - forms supportgroup for the intellectually challenged, sets task to "help everyone" so he can get more fame/ad dollars - and pledges to kick everyone out thats critcal of him, or anyone - at a starting level of that dude, deciding on who should participate, has half a brain, and an alterior motive to begin with (get more loyal youtube viewers.).
If you want excellency at anything - dont go for that. Never in your life, go for that.
Exchange that for a group of people that string each other up, and nag each other all day - that have fights over who is correct, and that shun noobs like they are the worst thing on earth - and you are much better off, when it comes to getting real information..
Because you are not being played - by a halfbrain, and have real (not PC coated) social interactions, on the internet. And an environment thats suitable for you to develop well in. Basically.
If it doesnt become too toxic.
A little counter intuitive - but you'll get it eventually..
If you are the youtube personality in question. I'm sorry. I don't know you personally. You are just acting 'too youtuber'.
edit: Like came in before the rant.