What is Dallas? What is Houston? Which parts do we measure. are we talking about road distance? That something doesn't change during a conversation is not the same the thing as them never changing
If someone claims "it's 500 miles from Houston to Dallas" they're wrong.
I could imagine ways we could interpret “500 miles” the same way as The Proclaimers i.e. as a noteworthy or arduous distance, under which that claim “it’s 500 miles from Dallas to Houston” isn’t contextually false.
More interesting is what knowing that things are not the case tells us about what we can know is the case. I don’t think it reveals much, but I’m not sure
My apologies for this and with the omission I don’t disagree one bit with your reply.
On the other hand I can see how we might imagine ways we could scientifically sarisfy ourselves beliefs are not absolute, but I’m not sure how we could satisfy ourselves they are