No. This is not the solution. I would like to clarify that another level is referencing the Level Sequence, but it should not be. The level sequence was created in the main level, not the referenced level, therefore, how are you supposed to delete that other level without deleting the sequences altogether from the main level?
That would be a NIGHTMARE if this is the case, having to rebuild over 100 sequences because there is no way to change the reference location where they are storing additional data.