This doesn’t seem right to me. That might work for normal levels, but going “max speed” for the fast levels requires you to do every single kanji lesson as soon as you level up, and that’s a lot more than 25 (especially under the old system, which would give you vocab from the previous level first).
That being said, going max speed is a bad idea in the first place. I did it back in 2020, and I wouldn’t recommend it.