I can't confirm it or not. But I've had to use tutorials many times when I was new to OBS Classic and I had recently moved to OBS since CLR Browser stopped working for me on the classic version.
One of my friends claimed that it did work. But from one of the tutorials 1080p 60fps was exclusive to Twitch partners I assume that might be where you are streaming.
Although when my friend tried it he said 60fps seems to work.
I myself only stream at 1280x720 at 30fps.