I think that is an interpretation of the graph showing sea level rise since 1994, which is on that page.

Looking at the graph there it appears the slope from 2010 onwards is steeper than before 2010 but I'd have to look at the raw data to check.

Edit: It's clearer on the second graph below. From 1870 to present it looks very much like an exponential growth curve, particularly the last few decades.

The second graph is evidently curved, but it can be fitted quite good by a parabola. Crappy fit: https://imgur.com/a/ViBR21p

Why do you think it is an exponential function?

Exponential or parabolic, the rise is still accelerating. The second derivate of sea level is positive in either case.

Yep, like .2 mm/y^2. Exponentials grow much faster than parabolas. When you see that an exponential changes from almost 0 to something, it will change from something to too big to fit in the graph soon, really soon. Parabolas grow more smoothly. The difference is important to make some realistic predictions.