Why does everybody seem to think tarifs are not already priced in ?

It was literally confirmed on Friday before market close and the market already had priced it in by going down a few percents intra day ? I understand that they might hurt some companies future earning projections because the cost of goods will increase which means their products price will have to to adjust for that which means consumers might not be able to purchase these goods... But that will only be the case for consumer goods ? I don't see why the tech and semi industries (90% of what people are investing on) would be that hurt especially AI which is mostly B2B ?