That's a practice called segmenting. Some groups do it, some don't.
There used to be a group named NOsegmenT who were staunchly opposed to the practice and included a little diatribe against it in all of their NFOs.
Also bear in mind that some groups have (in the past, at least) had pre-air sources. LOL/DIMENSION, one of the most well-known TV groups, were called out on the practice of obtaining shows from a pre-air source then manually adding television station graphics a couple of years ago. They would "pre" their releases almost instantaneously after they finished airing.
There used to be a group named NOsegmenT who were staunchly opposed to the practice and included a little diatribe against it in all of their NFOs.
Also bear in mind that some groups have (in the past, at least) had pre-air sources. LOL/DIMENSION, one of the most well-known TV groups, were called out on the practice of obtaining shows from a pre-air source then manually adding television station graphics a couple of years ago. They would "pre" their releases almost instantaneously after they finished airing.