This is quite true but the question does arise as to whether this is a Renewal or is, in fact, an Initial Issue?
There is no question, the OP holds an instrument rating and the fact that, most recently, the privileges of that rating were exercised on an MPA is not relevant.
It is likely that the rating was first earned on an MEP, which would have included SEP privileges, but, in any event, all that is required is to
renew the IR privileges - the nature of those privileges is determined by the aircraft on which the proficiency check is conducted.
Think about it this way - does the holder of an SPA-ME-IR have to pass another
IR skill test to extend the privileges of his IR to a MPA type? No, he has to pass a
type rating skill test which includes revalidation or renewal of the IR with MPA privileges on the specific type.