No, it is completely solid mahogany. I just spec'ed a featherweight body. Mahogany can vary greatly in weight.
The original '58-60 Bursts were almost all between 8 and 9 pounds. It was the later ones, particularly in the Norlin years, that got to be super-heavy. It has to do with the quality of mahagony. Older growth, high altitude mahagony that has been dried for a longer time will be lighter in weight. Today's reissues have returned to using quality mahagony, though its now Fijian instead of Honduran. The vast majority of reissue 1959 and 1960 LPs weigh between 8 and 9 pounds again.
This does affect tone. They say heavier wood will sustain better, but lighter wood will resonate better.