If you compare with the relative cost of the advancements, that's not true. A fancy 8k tv today is still very expensive.
That's not how you compare prices.
How do you compare prices?
You compare like-to-like. You compare the same kinds of bread, not cheap white bread to artisanal. You compare a 27" 1080 TV to another 27" 1080p TV, not an 8k TV.
But like-to-like isn't just "resolution" and "size". I'd never buy a tv with a comparison like that.
My comparison would be as if I took a "low/mid/top end tv" in 2000 and compared it with a "low/mid/top end tv" in 2021. In that case, it is still about the same price, especially adjusted for inflation.
In that case the way you compare things is not the way most people do. Most people care more about what they’re getting then where it falls in the product stack.