Is there a difference between saying “he was a *mudallis*” and saying “he used to practice *tadlis*”?

The questioner : Regarding the issue of “he used to practice *tadlis*” versus “he was a *mudallis*,” naturally, some scholars say that the statement “he used to practice *tadlis*” is milder, or that it does not, for example, invalidate the chain of the hadith, unlike the statement “he was a *mudallis*.” So what is your opinion, O Shaykh?

The Shaykh : I do not know this distinction, nor can I distinguish between them, because “he used to practice *tadlis*” is a present-tense verb, meaning it is his habit...