I'm kind of with you, but I read that sentence a little differently based on the rest of the article.
First, the agreement: I personally would move a lot of money for a better rate, but it would have to be non-trivially better. I'm thinking if I'm getting 0.75% now, it'd have to be 2% or maybe 1.5%. Not positive. Maybe you'd have a lower threshold.
The other point to me, though, was that Wang is arguing that the banks won't feel the need to increase their rates because they are already attracting so much money in deposits as it is. Whereas before they would have to pass on the higher interest rate to their customers in order to attract the deposits, they now are flush with cash themselves that they don't need to attract more deposits. And maybe ALL banks are feeling that way (again, in Wang's opinion, I think). So, the overall competition for deposits is low, which means higher rates are just increased profits for the banks.
Not arguing correct or not on that, just sharing how I understood it.