Not if he consolidates them in a WabiSabi coinjoin, observers would have no idea if those inputs are owned by 1 person or 20 people.
If you consolidate 20 inputs into 1 output then, unless taproot or multi-sig as destination is used, all inputs are probably owned by one person.
Can you give me an example of private consolidation with wasabi? I do not understand. You mean after the coinjoin or during coinjoin?