I did. He needs to read his own links. It says:
Question: Can WD-40 Really Help Arthritis?
Believe it or not, using the lubricant WD-40 for arthritis has become both an unproven and potentially harmful folk remedy for pain relief. Some people swear that the lubricant WD-40 can ease painful joints. Can the lubricant WD-40 really help arthritis? Let's dispel the myths.
Answer:
WD-40 for Arthritis - Just Another Folk Remedy