No, both are correct. Goldman, like all finance firms, have universal corporate titles that exist independent of job function. Associate, VP, MD. Those titles apply to tech, to traders, to HR, anything. There's a separate job description (ie, VP, forex trading systems design). Being named a "Senior Engineer" is a separate title. You won't be named Senior Engineer unless you've been a VP for at least 10 years.

I think you're right according to levels.fyi: https://www.levels.fyi/?compare=Goldman%20Sachs,Google,Faceb...

I got an interview request from GS for a "Managing Director" position and I was really confused at first because I'm clearly in the IC track. From what I could find it seems equivalent to a Staff role.

That's actually unusual. An MD typically runs a department. The role should have 100+ person reporting tree to be an MD.