The table is correct. However, the table you pointed to earlier doesn’t address SonarQube Server at all. However, you can upgrade from any point release to any point release, so 2025.1.x → 2026.1.y works.
Why would you want to update to 26.1? it’s recommended to stay on latest community build release. If you are on 25.10.0.x you should update to currently latest 26.3.0.x with intermediate 25.12.0.x or 26.1.0.x (both are acceptable due to a bug on particular DBs in 25.12.0.x).
Indeed our table and calculator are not consistent here, but we decided to keep it that way to not complicate calculator.