Soka Gakkai can not even be considered Bodhisattvas (let alone Buddhas)

"Since the Buddha [of the “Life Span” chapter] is revealed as the Buddha who attained enlightenment in the remote past [and all the other Buddhas as his emanations], it follows that not only the great bodhisattvas whom Shakyamuni himself taught in his transient status, but the great bodhisattvas from other realms [who were taught by the Buddhas of their own realms] are also in fact disciples of Shakyamuni Buddha, the lord of teachings. If, among all the numerous sutras, this“Life Span” chapter should be lacking, it would be as though there were no sun or moon in the sky, no supreme ruler in the nation, no gems in the mountains and rivers, and no spirit in human beings." -- The Opening of the Eyes

For those who don't get it, SGI by their own admission are not disciples of Shakyamuni Buddha of the Juryo Chapter, the eternal Buddha. Therefore, they can not even be considered bodhisattvas.