Do i have podcasts premium while i have apple music premium?

Each podcast creator can do what they want. See the information in the following website for creators: https://podcasters.apple.com/878-subscriptions including the following:

Let your fans contribute to your audio ambitions and provide them with more of what they love. You can offer shows with paid subscriptions, or fans can listen to free shows that come with additional benefits when they subscribe, such as ad-free listening, additional episodes, early access, archived episodes, and more.

Each podcast creator determines what options they want to offer for their podcast. It isn't affected by whether or not you have an Apple Music subscription. Also see: Get and manage your Apple Podcasts Subscriptions - Apple Support