It seems like it's a known issue with itch.io that they never really solved. You'll get notifications to games you bought, but not creators you follow. There doesn't seem to be a way to fix this.
The devlogs SHOULD be posted on your feed, but it just doesn't happen all the time.
You don't have to be a patreon if you wanna follow that, it will always post publicly the teasers and updates.
And we have a twitter
https://twitter.com/sbarpg
I should probably be more active on it and advertise it, but it does post when the updates/teasers happen as well.