I got this same error its nothing to worry about my app still is offered on all devices.... and i wouldn't us the amazon export it performs worse then Crosswalk except on the first kindle fire from tests ive done...
I think it says that just because it detects HTML in the formatting or something IDk, but it will still work for you. My game is on all kindle devices and i got that same error and nothing happened its just how their apk online scanner works thats why that message say may contain links. when it goes the the approval stage you wont have any issues