Oh, cool, Huawei actually did try to sneak past Google’s ban. And even in a more sophisticated way than I thought: Instead of simply preloading Gapps, they created an API and an app, allowing the user to sideload it.
Futile attempt, of course. As of today, the Mate 30 no longer passes Safety Net (as expected). So why go through all of this trouble? My guess would be that without the Gapps software being present on the phone, it can’t be confiscated by customs.