I grew up very close to the lake. I'm well aware of the flooding that occurred. It indeed would have been better to use a satellite photo from 1989 when the pumps were shut off. I think the contrast is still pretty stark regardless [1].

1. See this youtube video which shows a photo from each year from 1984 - 2020. https://www.youtube.com/watch?v=THg0AEV7nK8