you are not self-employed. when it refers to k-1 it should have been limited to saying partnership K-1. the "solo" 401K must be a plan established by the S-corp and contributions to it are done through wage reduction and employer (ie S-corp match)
************************
see this link
https://www.financestrategists.com/retirement-planning/401k/can-an-s-corp-have-a-401k-plan/
consult with a retirement plan specialist so everything that can be done is done correctly.
