There was an entirely new textile and way to sell it during the French revolution. Ads for it were plastered all over, and people swarmed to buy it for clothes or drapes.

That doesn't change that the Revolution still effected people. Especially when the government showed up to commit massacres.

Unless someone has said there was a great depression, they wouldn't have noticed

That's just not true. Not only from joblessness, but from the general collapse of the economy. Everybody saw everybody going through hard economic times. For example, if I had no information input regarding the 2008 Great Recession, I would have still known that there were bad economic times from the amount of people that begged me to give them food and shelter. I got to see the abandoned neighborhoods, and that was a recession. The thing about major economic shifts is that you'll absolutely get a feeling for them in the general population because it's one of those historic events that actually does have the most direct impact.

A hundred million died, and the country with Billions didn't notice.

They noticed, but the issue is that they're not allowed to talk about it. You can't just have a whole town lose 30% of it's population, and their primary meat source come from grave robbing, and say nobody noticed. If you're eating your own dead children, you tend to notice.

The atrocities were noticed, but it's a crime to talk about them or bring it up, not to mention it's horrifically painful for those who survived. Not noticing is not the same as intentionally lying and covering up what happened. The events were well documented, but they just weren't publicly made available.

A good example of this was when (in the 1980's) a mass grave of over 100,000 people was discovered outside of a major Chinese city (I forget the name). Nobody knew who they were or what happened until the government investigated it with some surviving witnesses to the event because the corpses weren't that old. Turns out they were a mass grave during the civil war when the CCP attacked a Nationalist town using civilians as human shields, marching them as bullet sponges into Nationalist machine guns to cover their infantry assault. Considering a huge swathe of the city died, and that it changed hands, it was clearly noticed. But it was covered up after that because it makes the government look really bad.

Not noticing is not the same as lying, covering up, gaslighting, or forgetting.