This whole fight is about something called the "bona fides news exception." Basically, in 2006 the FCC ruled that late night interviews were always bona fides news interviews (and therefore not subject to equal time), on January 21st FCC Chairman Brendan Carr wrote a letter suggesting (but not declaring) that the 2006 ruling was incorrect and might be revoked.

Separately, currently elected politicians are pretty much always considered to be bona fides interview subjects, even if they happen to be running for reelection, because e.g. the Governor of Pennsylvania expressing opinions is news.

If CBS lawyers wanted to fight and bring Talarico on, they would probably win- the letter is not actually changing the rule, and the FCC would have to defend the rule change in court and would probably lose. But the point is that CBS has determined to be working towards the Fuehrer, and wants to do so, and so they are doing what they are doing.