A website lists some activities offered in a photography tour, then adds Not only that, but there's more.
... [S]unset and moon rise occur at the perfect time and will allow us to photograph New York Harbor during the day and the New York skyline at sunset, the blue hour and at night from the incredible vantage point of Liberty State Park and the Empty Sky Memorial. Not only that, but there’s more. There will be a full moon rising shortly after sunset... .
Is the sentence grammatical or generally acceptable?
I think but should introduce a contradicting idea, but it doesn't do that here. I think the but should be removed and replaced with a comma or a dot. Do you agree? Why?