“There are some indigenous peoples who never heard of the bible or if they heard of it, it came from missionaries and they might be negatively inclided towards it. Are you going to say someone who never heard of the Bible is not a Tinok Shenesba?”
The 7 mitzvos are considered to be Inherent, Natural and logical
The onus therefore is upon everyone to figure out at least the basics by themselves
The simple indigenous peoples invariably have less problem with this than enlightened urbanites for the record