The use of several legitimate designations is not itself a narrator defect. People can be known by a given name, lineage, and different kunyas. A different question arises when a transmitter deliberately names a teacher by an unfamiliar designation to conceal the teacher’s recognizable identity; that may fall within tadlīs al-shuyūkh.
Nor may two names be combined simply because they look similar. The remainder of the isnād, teachers, pupils, and chronology matter.
The distinction is between ordinary identification work and a demonstrably deceptive reporting practice. Not every variation is tadlīs, and not every case of tadlīs is harmless alternative naming.