Have been involved with many timber stair jobs in the past, they used to be the standard for public stairs.
11" x 2" treads & stringers on 10"x3"x2" chocks don't see so many now though.
That said they all have the same basic requirements which this one would appear not to meet!
Where's the Stair guard rails? not to mention the SG4 guard rails or the big F**K Off unprotected opening at the top, maximum 16 risers per flight it could go on!