According to Osho, when Buddha called life 'misery,' he wasn’t stating a universal fact or his own experience; he was reflecting the questioner’s inner state. Buddhas answer questioners, not questions. Such statements are compassionate devices to break beliefs and trigger inquiry, tailored to the seeker’s condition—hence Buddha’s seemingly contradictory answers to different people.
Buddha said “life is misery” to someone who felt miserable, to help them wake up—it wasn’t a fixed rule about life.