The text reads that you would need to play 60-70 battles in a day to reach 50% ECR (with the obvious assumption that you start at 100%). There is no text stating that this is supposed to be 60-70 battles every day as that is pretty obvious that would take you way below 50% for the whole season.
Again, the point is that most players aren't even close to 50% ECR in general so this change shouldn't affect them. What is being discussed here is completely irrelevant to what the team was actually trying to address.
Please read carefully the full text:
"Most players won't be affected by this change as to get below 50% you would need to play around 60-70 battles in a day"
Where stand that you start by 100% ? I cannot found this.
If you play 60-70 battles a day you will be affected latest at the second day.
I think really that nobody understand this sentence in this way you (want) understand him.
Why you cannot just say: "Ok this was not correct - we will publish a correction / clarification" ?