Onward was released to theaters on March 6 in the USA it made $61,555,145 before theaters shut down, putting it on Disney + April 3rd, was Disney gesture of giving something to watch for people being impacted by pandemic. So no Onward didn't directly got to Disney +.
Apple also made a lot of free content and some free Channels at the same time.
Ah thanks for the correction. With a 200 million dollar budget, I imagine they still burned plenty of money on that film though.