I don't think he is correct. I think the events are already scheduled to appear, on a continuous cycle. I don't think we will actually receive any new patches every Tuesday. What will be released every Tuesday is already added in 1.5.7According to serebii joe, there still small updates until June.
Maybe no more main levels, but only special levels from time to time.
https://twitter.com/JoeMerrick/status/963326988185407490
Time will tell though..