I think links in posts have been restricted for quite a while. I never put them in now at all except if I’m boosting a post.
The changes have come in where in the newsfeed the shop posts appear. Because I don’t have that many actual friends and some of them post infrequently, I am able to get down to the bottom of their posts on my timeline, and then I start to see posts from pages I am interested in.
From the other side of it (the shop side) I have noticed that my post reach is still the same about 48 hours after I have posted, BUT it grows slower. This would tally with people only seeing it when they have fewer unread posts from friends.
Sam x