The plot is NOT quite consistent with the estimate, but exact consistency between different astro sources is hard to find. Calculations of the model quantities vary somewhat between sources. This is a consequence of uncertainties in the modeling.
About 3.5 Gyr from now, the Sun will probably be ∼ 30 % brighter than now.
The solar brightening is a pretty modest change for the Sun for next 5 Gyr or so.