I think you misunderstood the comment. In political science both "absolute majority" and "simple majority" are what you would commonly refer to as "majority".

The difference is that a simple majority is defined as 50%+1 vote of all votes cast, whereas an absolute majority is 50%+1 vote of all possible votes

Edited: I re-read the comment, he used the wrong term, and should've said plurality instead of simple majority. I hope this now makes sense now.