According to Osho, Patanjali’s Yoga Sutras contain no interpolations; they remain absolutely pure. Because the text is ultra-concise, aimed at a few prepared seekers, casual readers lose interest. Its sutra-form and long oral preservation deterred tampering, and any addition would be instantly noticeable—like trying to hide a branch in a perfectly compact seed.
No—it's so condensed, specialized, and carefully preserved that nobody could slip new stuff into it.