Interesting and very poorly worded. The regs need to get away from using legal land descriptions and start using GPS since it is becoming harder to find resources showing you where the legal land description is.
You can use the following map, type in 4-22-46-2 W5. The west line is the boundary being referenced(larger square is 22-46-2 W5). So the area still closed until June 1 is the NW end of the lake. It would also appear all tributaries and the outlet at SE end of lake are closed until June 1 as well. Poorly worded though.
https://www.lsdfinder.com/map