Not quite. When you remove a drive you invalidate parity (unless you have taken a special step to make sure it is all zeroes).
what you should do is use the Tools->New Config option and then return to the Main tab to make any changes to the drive assignments (this can involve,adding, removing, re-ordering drives). When you start the array to commit the assignments, Unraid will start rebuilding parity based on the new set of data drives.