Followed the link, watched the how to vid, looked up getting netflix to run on kodi... Netflix isn't really supported & sounds like it is likely to break. I need a couple of devices my parents can use & none of this really looks like an interface they will appreciate. Unfortunately I just don't think this is it.
What Patrick said.
1. Get Raspberry Pi and SD card
2. Install this - https://kodi.tv/download/raspberry-pi/
3. Install the mobile app
4. Reboot, connect to wifi
5. Start surfing channels
Took all of twenty minutes when I did this for my dad.
(Of course, I then spent hours downloading extra plugins and connecting it to Dad's paid Kayo Sports account. Don't do that!)
Discussion
Netflix is pretty hostile to FOSS attempts at accessing it.
If they need reliable Netflix access, you're going to need a big brand...
Okay, I found some different screenshots of kodi (tho maybe not running on a pi?) That make it look like a more reasonable interface. It has a browser... Netflix runs in a browser 🤔
Try it! Netflix is a bit obsessive about preventing password sharing, so they're rather heavy-handed in what they block.
But if Kodi's web browser is supported when you try it, I daresay it will stay supported.
There are a number of different "skins" for Kodi that can totally change the UX. Too many, perhaps!