Yes, you are right. Do you think I should make the video technical or just a showcase?

I'd go for something more technical, it feels like your target audience are hackers and not people shopping for an OS.

But as always, it's your project done for yourself, so whatever feels like more fun recording.

On the other hand, for future employers you might wanna simply showcase the creation. They don’t have all the knowledge to appreciate the technicals or even the time to sit through it.

Do both :-)