That's exactly my point... I don't think we can say that technology is deflationary because there are so many factors in pricing. It should definitely reduce costs to corporations... but whether those savings get passed onto consumers is a whole different discussion.
Again, if it was true, you would expect household grocery expenditure to be significantly cheaper than in the 1970s, or the 1940s - and I'm just not sure that's happened.
I think you could say the same for cars.
In 1967 a new Ford Sedan cost $2,199 which is about $20,086.33 today. I'm sure Ford has so many more robots and process efficiencies now, but the average new car price now is around $43K.
Technology is just one piece of the puzzle and I don't think it can cause deflation just by itself.