Are you saying the Tech Op job is identical to the Line Supervisor job in terms of responsibilities and job size (job evaluation points/grade/salary)?
Were the employees who are being made Tech Ops also Line Supervisors or Tech Ops or something different? And is the Tech op joba promotion or sideways move for them?
I expect teh company is restructuring and may be asking people to apply for the new roles or matching them, and the Tech Op job size will be claimed to be lower than your Line Supervisor.
Have Line Supervisors been given a chance to be considered for teh Tech Op job