No, because it doesn't rest on the fundamental assumption that the past was right, nor the corresponding political will to return to "the way things were."
History is a record of advances and regressions. Referencing history does not fundamentally result in a conservative political outlook; what makes an outlook conservative is the one-dimensional (and frequently reactionary) analysis that things must go back to how they were, or as closely as possible.
> what makes an outlook conservative is the one-dimensional (and frequently reactionary) analysis that things must go back to how they were, or as closely as possible
I'm wary of any attempt to sum up an ideology in a one-liner, since they tend to be lossy and dismissive. Your definition lines up more neatly with anarcho-primitivism than conservatism (at least modern American conservatism, with which I'm most familiar).
In general people live their lives based on what they are convinced is ethically right, they aren't brainless automatons following a simple algorithm of "old good, new bad" or "new good, old bad"
Anarcho-primitivism is a discrete variant of the overarching conservative phenomenon: when an-prims go say "go back" they mean a specific and particularly reactionary set of social transformations. This doesn't mean that ordinary conservatives don't desire social regression; it just makes them not as openly reactionary as the most reactionary social conservatives.
You're right, of course: any short and pithy summary of an ideology is going to have gaps. American conservatism is "funny" in the sense that it admits of additional gaps: there is a significant (although continually diminishing) population of "purely fiscal" conservatives who have dominated American intellectual conservatism, for example. And this is true for progressive movements as well, particular in the context of labor.
I consider myself generally conservative but would sum up my outlook more along the lines of "change isn't necessarily/automatically good" than "the past was right". Chesterton's Fence etc.
I don't consider myself a progressive per se, but I think their framing would be something like this: change, if not good in itself, frequently begets opportunities to make things better.