I haven’t yet watched the video, but Minecraft definitely has an official marketplace and in game currency. It is for the pocket edition/bedrock edition
I’ve bought numerous skins and game mods for myself and the kids to enjoy.
From what little I understand this is quite different from the Java edition, but I don’t really know.
Minecraft doesn't have an in-game currency, and mod developers don't have any kind of marketplace relationship with Mojang.