Earlier quoted context omitted.
Everything starts with an assumption. However, in science, if the assumption's conclusion doesn't match the observed evidence, we reject our assumption as true, and we start with a new assumption. As so, science doesn't have a "foundational" assumption (because it's willing to change its assumptions). Rather, science subjects assumptions to evidence - not the other way around...
> science doesn't have a "foundational" assumption Yes, it does: it assumes that evidence is a reliable guide to truth.
"evidence" and "truth" are very semantically related. By semantics, "evidence is a reliable guide to truth" is not nearly an assumption... as it is a logical definition.
It's a bit like saying: "it assumes reddish color indicates red".
EDIT: "Reliable" is the problem word here. Remove it from your statement, and it certainly is no longer an assumption. That said, I don't see where science inherently makes the assumption that evidence is reliable...