Earlier quoted context omitted.
Quite the opposite. Value is essentially a function of scarcity relative to desire. Food desire may be, for all intents and purposes, stable, but availability is most certainly not. Something like a major weather event wiping out a crop can quickly change the scarcity profile. Food is especially prone to value variances over time.
What specific definition of value are you using here? Sometimes terms with value get into the same realm as price, but the default definition of value is the benefit you're getting, and going to similar restaurants ten years apart is damn near the same benefit. Scarcity doesn't come into play.
However, if we are to change gears, the benefit you get out of a restaurant isn't constant either. Aside from maybe those trying to serve the elderly population, where there seems to be a viable niche of providing "remembrance of how things were in the good old days", restaurants that try to offer constant value quickly go out of business. They are forever needing to up their game to appeal to the typical clientele. Customers want increasingly more benefit as time marches forward to justify the visit.
An individual's perception of benefit is personal, so it is true that any given individual may not find increased benefit in restaurants trying to outdo each other by offering more and more benefits, but within populations it seems quite apparent that restaurants that "win" generally are offering more benefits (higher quality/more exotic/creative food, increasingly sophisticated ambiance, etc.) than they did in the past.