It said the broadcaster had posted material that contradicted expert advice about the coronavirus pandemic.
But it explained its U-turn saying it sometimes made exceptions to guidelines that state repeat offenders face a permanent ban.
TalkRadio said it had yet to be given a full explanation for the affair.
The decision to ban TalkRadio had appalled digital rights campaigners, with one group - Big Brother Watch - claiming it was evidence that "big tech censorship is spiralling out of control".