@FlameseeK
I'm sure you're already aware of this but just as a reminder: you're trying to listen to podcasts made for native Japanese speakers. You will not 100% understand the podcasts even if you know all of the N2 vocab and grammar. You just need to remember that you WILL struggle at first (we all did/do), so saying things like "despite having studied all vocabulary and grammar points in Tobira, it still seems impossible to follow podcast conversations" isn't exactly the right way to look at it in my opinion.
Think of it like trying to gain muscle. The only way you'll gain muscle is if you work out frequently. Similarly, the only way you're going to improve your listening skills is to frequently expose yourself to material that is at or slightly above your skill level (however, too far out of your skill level and it's useless though). The podcast you linked seemed like it would probably be appropriate for someone N2-ish level, *maybe* N3 if their listening skills are good based on the small clips I listened to. A podcast that I used for practicing for N2 was たまむすび, but the difficulty was all over the place depending on the topic or guest.
One thing that has personally helped me recently bring my listening (and speaking) skills up quickly is having active conversations with Japanese people. Having a conversation with someone forces you to be more strict about your skills in order to appropriately respond and understand what your friend is talking about. So, if you have someone you can reliably chat with then it might be useful. Otherwise keep a podcast or movie or drama or whatever playing in the background as much as possible and try understanding as much as possible.
I'm sure you're already aware of this but just as a reminder: you're trying to listen to podcasts made for native Japanese speakers. You will not 100% understand the podcasts even if you know all of the N2 vocab and grammar. You just need to remember that you WILL struggle at first (we all did/do), so saying things like "despite having studied all vocabulary and grammar points in Tobira, it still seems impossible to follow podcast conversations" isn't exactly the right way to look at it in my opinion.
Think of it like trying to gain muscle. The only way you'll gain muscle is if you work out frequently. Similarly, the only way you're going to improve your listening skills is to frequently expose yourself to material that is at or slightly above your skill level (however, too far out of your skill level and it's useless though). The podcast you linked seemed like it would probably be appropriate for someone N2-ish level, *maybe* N3 if their listening skills are good based on the small clips I listened to. A podcast that I used for practicing for N2 was たまむすび, but the difficulty was all over the place depending on the topic or guest.
One thing that has personally helped me recently bring my listening (and speaking) skills up quickly is having active conversations with Japanese people. Having a conversation with someone forces you to be more strict about your skills in order to appropriately respond and understand what your friend is talking about. So, if you have someone you can reliably chat with then it might be useful. Otherwise keep a podcast or movie or drama or whatever playing in the background as much as possible and try understanding as much as possible.

