Shadowverse

Yes, they buffed it. So, it was a decent map.

But now, you can also occasionally get 1-mana followers like the water fairy.

That's some insightful analysis. A card that draws a card with a strictly fixed mana cost is one of the strongest things, especially if one overpowered deck (as I understand) is built specifically around a card with that mana cost.

Do they really give such comments in the patch notes? Or is this guy making it up...

They don't give them in the patch notes; it's just that Ben has started actively providing feedback to the community, and these comments slip out. At the very least, "counter with other decks" is definitely there.