It isn't - or wasn't when I still listened every now and then back in the time when it was available to all [1]. He did interview scientists who often talked about their fields, leading Rogan to first assure the guest(s) that he - Rogan - is just an idiot upon which he would ask questions which often revolved around some of his favourite subjects: nutrition, DMT, physical training, DMT, aliens and did I mention DMT?

What made his interviews interesting is that he, apart from the mentioned standard hitching points, was inquisitive and unafraid to ask 'stupid' questions. Those often gave the guest room to delve into his or her subject of expertise, enlightening the listener and Rogan at the same time. Only a few of the guests were scientists, most were comedians, MMA fighters, ex-servicemen and such. Things might have changed since then but I can not imagine him ever labelling anything he does as 'science'.

[1] this period ended when he sold out to Spotify

It isn't a science podcast per se, but he actually has a lot of scientists/science educations on. Neil deGrasse Tyson has been on four times, Sean Carroll three times, Brian Cox twice, Brian Greene once, Roger Penrose once, etc. (those are just the science people I remember off the top of my head, there have been lots) He's had Richard Dawkins, Elon Musk, John Carmack, Sam Harris on if you're into them. But it's very hit or miss. He has about as many quacks on as legitimate scientists/educators.

He does like 3-5 episodes a week, and they're each 2-4 hours. So there's a shitload of content, much more than I could ever sit through. When I was commuting ~3 total hours each day, podcasts were my medium of choice, I would generally listen to maybe one of his podcasts per week and skipped the other 2-4 after listening long enough to know that I didn't give a shit about the guest, whether it's because they were a quack, some random boring comedian, or some meathead MMA person.

He is (rightly) criticized for having lots of shitty guests on, and that criticism is fair. But the fact that the podcast is often bad doesn't mean that it's always bad. When the podcast is at its best, it is very, very good.

On the website the episodes are broken down by category, so if you want science content you just click "scientists". Unfortunately Joe is too dumb to tell the difference between the real scientists and the fake ones, so most of the quacks are lumped in there too.

https://www.jrepodcast.com/episodes/scientists/

Many of his fans consider it a science podcast, scarily enough. The also consider the conspiracy theories he talks about to be real as well.