Is it the renovation of the "Splatoon 3" stage "Mategai spillway"? Temporarily suspended from 9 a.m. on April 16

Is it the renovation of the "Splatoon 3" stage "Mategai spillway"? Temporarily suspended from 9 a.m. on April 16
 Nintendo will suspend the opening of the "Mategai Spillway" battle stage for the Nintendo Switch shooter "Splatoon 3" from 9 a.m. on April 16 to 11 a.m. on April 18....

The linked article is in Japanese.