Yes—according to Jain doctrine, Rishabhdeva did not attain Manahparyay Gyan. He attained Kevaljnan.

In Jain philosophy:

• Manahparyay Gyan is a rare knowledge found in highly advanced ascetics.
• Tirthankars, including Rishabhdeva, are known for attaining Kevaljnan, the complete and perfect knowledge.

So the correct understanding is: Rishabhdeva attained Kevaljnan, not Manahparyay Gyan.