That app is for artists and record labels, it allows them to manage their accounts. The Bandcamp app that most people use to purchase those artists music is not there.
Yes, you have linked to "Bandcamp for Artists and Labels", which is not the same as the plain Bandcamp app. I had Bandcamp installed on my phone via Play Store. I can still use it, but the app is missing from my list of apps on Play Store.
that link points to 'Bandcamp for Artists and Labels' (com.bandcamp.artistapp) which is different than 'Bandcamp' (com.bandcamp.android) [0]