It is a raid in that it's not expected, it relies on not being expected, and they come and take away your stuff by force. Maybe it's a legal raid, but let's not sugar coat it, it's still a raid and whether you're guilty or not it will cause you a lot of problems.
I mean it's not like people get advanced notice of search warrants of that police ask pretty please. I agree that the way people use the term it's a fine usage but the person using is trying to paint a picture of a SWAT team busting down the door by calling it that.