It crossed back over the other way in late 2018. https://trends.google.com/trends/explore?date=all&q=blog%2Ctumblr&hl=en-US
Edit: Wordpress has even eclipsed Tumblr in recent years. https://trends.google.com/trends/explore?date=today+5-y&q=blog%2Ctumblr%2Cwordpress%2Clivejournal&hl=en-US
It's working now, but I'm not sure what changed.