It's very unlikely that the discounted overseas textbook market constitues a very large amount of profit. Indeed, it could certainly be seen as reasonable CSR project: "Let's sell our books at marginal cost+10% to poor asian students, but have legal make sure those copies can't cannibalise our domestic market". If it turns out legal was wrong, the response is more likely to be "though luck, the global price is now $100" instead of "drat, let's lower the US prices to $20".
Now, being nice, even charitable, should not be a ticket to get to write your own laws. But Wiley is unlikely to celebrate a ruling of global first sale doctrine by convening an editorial committee to produce a Filipino CS textbook (and a dozen other languages times a dozen other subjects), to then go and sell that at $20 there.
Also, on a tangent, as the lingua franca of CS is English, it's convenient to learn the subject in English. I was taught CS mostly in English, but one time where the teacher insisted on speaking Danish, it took me half the class to realize that oversætter (literally translator) was meant to describe a compiler.
The problem with that is that they'd loose the PH market which presumably is worth >$0 to them.
An alternative strategy is to "edit" the foreign versions enough to make them unusable in the US, such as changing the homework questions enough that anyone working from the international version will get them wrong, or fiddle the fontsize/linespacing/margins so the page numbers are screwed up. That would automatically enlist the help of TAs to warn against the horrors of foreign books.