I mean...you're not telling my anything I don't already know - I understand their methodology. It's just I think they might as well say:

"When top tier raids are released, they will most likely need healer dps to meet dps checks. As time goes on and gear increases, that requirement will lessen"

Stating as they did that the encounters aren't tuned for healer dps, when it exists for months with players doing it and needing healer dps - isn't really accurate to the experience a lot of their players will have.