The tidal interactions between the Earth, Moon, and Sun are complex and have various effects, but they do not result in a significant alteration of Earth's rotational period on such a timescale.
Currently, the Moon's gravitational pull does exert tidal forces on the Earth, causing a slight deceleration of the Earth's rotation over long periods of time. This effect leads to a lengthening of the day by approximately 1.7 milliseconds per century. This means that the Earth's rotation is gradually slowing down, but the change is extremely slow and not significant enough to stall the day at 19 hours within a billion years.
It's important to approach scientific claims with caution and verify information from reliable sources. The stalling of Earth's day at 19 hours for a billion years due to solar atmospheric tides canceling out lunar tidal forces is not a scientifically supported concept.