The creator and owner of the said Apple Podcasts service. It is their absolute right to decide who can host their content on Apple's service, Apple could ban anyone they want to, without any reasons. Apple is just saying their guidelines on hate speech is what they're using, they actually do not need a reason nor need to justify any action they take. You don't have that right at all to listen to anything you want on Apple's owned services.
This has zero to do with government or freedom of speech. Nobody has the absolute right to any speech in any private places in USA, the laws only protect your rights to speech in a public settings and not by government only, nothing to do with private companies nor private locations. You cannot yell fire in a movie theater just because you want to, you will be thrown in jail for creating potential harm or lies.