Because the president should have no say in naming geographic locations that have long agreed upon names. And it’s a waste of money to have to replace all the maps and books with updated names.
There’s also no reason for Google to change anything. The US government has no power to make Google use this new name instead of the widely agreed upon name.
It’s a nod to the fact that if Trump says jump google will say “how high?” And no one with any sense likes that bigot.