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 found one article which said they don't like Authy because it's more vulnerable to porting than GA.
But thinking about it now, I'm pretty sure there's no way they can tell which application was used to generate a token.
...aaaand I can still log in with Authy. I'm just going to ignore it.