The update notably buffed the Splattershot and Splattershot Pro by increasing shot speed by ~3%, intending for these to act as benchmarks for future balance.
This is a compression format used to reduce file size for easier sharing. Splatoon-3-Update-9.2.0.NSP.rar
For the best experience, you should always update through the Official Nintendo Support methods: How to Update Splatoon 3 - Nintendo Support The update notably buffed the Splattershot and Splattershot
This is a "Nintendo Submission Package," the standard format for digital games and updates on the Switch. Splatoon-3-Update-9.2.0.NSP.rar