So in vizard it says there’s 8 known visords other than Ichigo, but Tosen was a vizard to do it should be 9 . Also why aren’t Tosen and Ichigo on the list of known vizards?
Ichigo is on the list of notable members, he's even on the cover to that page. Tosen was probably something different since he went almost full Hollow with his last transformation. He basically had an advanced version of Hollowfication.
Because Visored isn't a species, it a group of those specific Hollowfied exiles, a group that Tosen in no way is associated with. Not to mention Ichigo is something completely different than a regular hollowfied shinigami.