Pretty much mate, yes. They are just a stud on a larger head(washer/hex, seem to be various styles but all are basically same thing). They are cast into the rubber, but over time as they are ferrous, water ,wicks up the sides and the starts the corrosion process. Same thing on the GTE hockey sticks too. Such a shame they did not use galvanised studs, but at the time if manufacture, life was ~10 years max.
You can cut them out and rebound new ones back in. Need something like Sikaflex522 and a retained stud.
https://www.hall-fast.com/bighead-mild-steel-male-threaded-studs-m6-x-50-213528
https://gbr.sika.com/en/industry/transportation/sealants/adhesive-sealants/sikaflex-522.html