According to Osho, you shouldn’t believe in samadhi or satori at all—nor should you doubt. Belief and doubt both close the mind. Practice trust: an open, experimental, vulnerable availability. Stay present and test within your own consciousness; truth proves itself. In the company of one established in samadhi, your openness lets it ‘infect’ you; then direct experience replaces belief.
Don’t decide it’s real or fake—stay open like listening to music, be near the peaceful one, and let your own experience show you.