That’s a web app, it’s on them if they don’t want to offer their services without requiring me to let them out of the web sandbox.
Now, if you're trying to be extra cute by saying "react native is a webpage with more steps," I'm not trying to have that fight, but I can assure you with 100% confidence that Joplin's apk loads without Internet connectivity, making it not meet my definition of "a web app"
And you can 100% load PWAs offline, which might be slightly more progressive than your idea of a web app, but I hope not overly so.
Whether or not the specific app used as an example happens to be a webapp holds no relevance to what he was saying overall.