Yes, there is a grease nipple which seems to work correctly and purges both sides. I also read about the problem of Oilite "smearing" if a blunt tool is used. The part that needs thinning is a bearing surface for the "ears" of the frame so it does need to maintain its original porous nature.
This is the second set of bushes, as slope replaced them during his ownership, but that was because he didn't have a grease gun at the time - he then bought one and gave it to me when I bought the bike from him. The current ones, which have been maintained, aren't worn yet but it would be good to be ready.
The TSR pivot makes the often-slated Brompton design look good. The Brompton pivot is small, plasticky, and costs a lot to overhaul, but it will usually last for years of use and abuse.