Remastering is just creating a new set of masters for the company to work with -- and "digitally remastered" simply means that the company created a digital master. Remastering does not mean that any restoration work was done, that's a separate process entirely.

The better companies when they have the funds available like to do at least some restoration when they create a new master, which is why you see the terms "remastered" and "restored" paired together often (and unfortunately contributing to the general public's confusing the two).