El Niño exacerbates the overall warming trend. But, it's effects are regional, not global.
While the annual divergence fluctuates (as some years happen to be hotter and others colder), there is still a definite upwards trend visible in the data. The year with the biggest divergence on record was 2016, when measured ocean temperatures were 0.8 degree Celsius higher than the stated average. 2016 was the hottest year ever recorded (in some calculations tied with 2020). According to a release by NOAA, 2022 was the sixth-hottest year on record, making the last eight years the eight hottest years in history.