It does sound like he went "above and beyond". Too bad it didn't work. Did he have you uninstall the existing version first?
If you're willing to consider more involved solutions, in the past an **unoficial** workaround has been the suggestion to download the game from an "APK website". A personal (and official) word of caution: downloading from a 3rd party website anything can happen. It's theoretically possible malicious code could be inserted or substituted for game assets and re-uploaded. That said, a bit of searching online can explain more about such sites' reputations and such threats. I cannot endorse such things here. Also this requires uninstalling 2.18.0 before installing 2.18.1 which means having a good account recovery plan.
Another approach is to install Google Play or OpenGApps onto the Amazon device. This too is a bit outside the scope of these forums. Much information exists on the internet. Feel free to PM me if you need a pointer. This should allow updating without having to uninstall first.
OR, just wait for the powers that be to sort it out. When this happened with Google, results were not instantaneous. I have reason to believe the same effort is being brought to bear on the Amazon issue as well.