Is it an error that they have Ritual as a starting technique instead of Ninjutsu for a Shosuro Infiltrator?

Just now, Dakion said:

Is it an error that they have Ritual as a starting technique instead of Ninjutsu for a Shosuro Infiltrator?

Probably not. There are very few Ninjutsu techniques, and they get privileged access to all of them through their School Curriculum anyhow.

They get access to every single ninjutsu through privileged access.