I think you got it largely right Hannahbanana,
I believe it is saying research is concentrating more on recovery, regeneration and protection of neurons, rather than just alleviate the symptoms of PD. They give examples of new agonists which are neuroprotective, compounds which prevent cell death (antiapoptosis), antioxidants and anti inflammation agents, and growth factors which renew and protect neurons etc.
I think research is going in a better direction these days.
Ron