It's a fraction of the subscribers, but it's not too far off in terms of activity (and hey, there's still 2E activity on that subreddit anyways). To look at the stats:
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As you can see, while one has 4 times as many subscribers, it's not really too far when it comes to actual activity, which makes sense given that the general Pathfinder reddit has been around for for 8+ years.
For comparison, Call of Cthulhu's reddit:
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More subscribers, but also a lot less activity. Again, part of being a game that has been around much longer and thus has had more time to create a community. You can see it more clearly on this plot here:
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This is comments per day, with Green as r/Pathfinder_RPG, Orange as r/Pathfinder2e, and blue as r/callofcthulhu. As you can see, the Pathfinder subs are fairly comparable while CoC has significantly less engagement.