IANAL, but it seems like the wording in the public-facing version of the policy is a little muddy. As far as I'm aware, "tax exempt donation" not a thing that actually exists in US tax law. It seems to be a conflation of "tax deductible donation" and "tax exempt organization".

Knowing how big corporations do things, that document was likely written by someone who doesn't fully understand the jargon or even how pedantic you have to be about words when dealing with legal concepts, who didn't set the policy themself, and who is not responsible for enforcing the policy. So we should take its specific choice of words with a grain of salt.