Here's the Side of Burritos video with two followup videos in the description (https://www.youtube.com/watch?v=IzpVI4zaso0)
I don't really know much about it to be honest, and the video is pretty old, and someone in the comments says the issue is fixed but I haven't seen that anywhere else. I just use Obtanium anyway since you can get most FOSS apps from GitHub, a for ones that don't, you can still find F-Droid apps. SideOfBurritos also has a more recent video about how to set up and use Obtanium if you're interested.
You can download the APK right from their website as well as I believe their GitHub.
Their website also has the certificate hash to verify with AppVerifier