Ok, but the president's executive order does not officially change the name of a place or feature. In the US, that function is overseen by the Board on Geographic Names. While they did enact a change for the Gulf of Mexico (now the Gulf of America in US documentation), it doesn't happen immediately. While I imagine the BGN will update Lake Ontario eventually as well, Google tips their hand as being eager to please the admin by updating their maps before there is a corresponding change from the appropriate governing authority.
We can't even accuse Google of consistency, because they show Türkiye as Türkiye, for example, even though (as far as I can tell) the US Gov still uses Turkey.
I'd argue showing Türkiye as Türkiye was consistent; in this case it's the Turkish government that's more likely to kick up a fuss and make life difficult for Google if their preferred nomenclature isn't respected
We can't even accuse Google of consistency, because they show Türkiye as Türkiye, for example, even though (as far as I can tell) the US Gov still uses Turkey.