Here tadlīs concerns hiding an intermediary while wording suggests direct hearing.
• Tadlīs al-isnād: omitting the person from whom this report was actually heard and attributing it to that person’s teacher; the described practice is impermissible. Contemporaneity or meeting does not prove hearing this report.
• Tadlīs al-shuyūkh: naming a weak teacher by an unfamiliar name, kunyah, affiliation or description so that the teacher is not recognized.
The first hides an intermediary; the second hides identity.