What Biden has not done: stop issuing drilling permits or impose export restrictions on fossil fuels. The former has some serious limits because of how the courts treat the right to drill as a property right once you hold a drilling lease, and the latter is simply untested.
We're still some years from hitting an ongoing sustained average of 1.5°C above what it was in the late 1800s. That's what people mostly talking about when they say 1.5°C
This year will be above 1.5°C. Which means we did reach that.
What you're talking about is the average of yearly average temperatures. But it's not what we're looking at. We've never seen earth average temperature above +1.5. And averages don't move much. I don't care if next year will "only" be +1.49...