While Target may have it marked as discontinued, until Nintendo officially announces it as discontinued, people will keep on saying it is not discontinued. That is just how it goes. I also believe we will never see Marth, Wii Fit Trainer and Villager again, I will continue to say they are not discontinued until Nintendo marks it as so.
Remember, official Nintendo statements have only said that we may not see certain Amiibo SKUs again in the future, but they did not comment on any specific Amiibos being discontinued yet. I believe that is what people are referring to.
Lastly, as others will say, just because Target discontinued it, doesn't mean all retailers/suppliers did. I'll check their status at GStop tomorrow to let you know, if you'd like.