Yeah, I thought they were the same so it seems to be a bit of scare mongering. I still use Authy.
There's security but there's also convenience and if I lose or break my phone, with Authy I have a backup and don't have to get a tonne of 2FA stuff reset.
I don't understand how they can support GA but not Authy. Sounds more like a falling out than a technical reason but I'd need to read the articles.