That's such a silly analogy it's tantamount to constructing a straw man. I don't have a background in mathematics either, but I think it's quite clear that the

That's such a silly analogy it's tantamount to constructing a straw man. I don't have a background in mathematics either, but I think it's quite clear that the use of "isomorphic" here as a stand in for code sharing is forced, to say the least. It's the same kind of silliness as using the term "tree shaking" in place of dead code elimination (which is, you know, an established technical term in the same field). In this instance however, instead of using a fancy-sounding word (which I think is a little pretentious), they've gone with an analogy with a less obvious meaning (what are you shaking from the tree? Are the good bits falling off also?).