The cam shaft is normally fine but they say the screen get stuck in there, that's why they replace. There is the odd time when a cam lob will spin out of place when the valves bend but not common.Its reason, but its also bottom dollar loss to VW to repair/recall. This also means they are going to lose customers, so not sure if it evens out or what. They couldn't find the screen unfortunately. The kit would be nice, but I don't think it replace the camshaft.
I'm in the process of rebuilding my TSI engine as well,... slow but sure.