Yu Wenzhou had been in the scene for all these years, and his hand speed was on record. His hand speed wasn't a secret any longer, everyone knew. As a rival, there was no way he wouldn't have checked these statistics, so Ye Xiu's question was clearly a taunt.
A hand speed of 200 was, in general, seen as the boundary between pros and casual players. Of course, this two hundred referred to effective APM, not button mashing.
Yu Wenzhou's status as a hand cripple was judged according to pro player standards. Pro players nowadays could easily reach 300-400 on average. Yu Wenzhou could only get past 200 with great effort, and usually averaged below 200. It was no wonder no one thought he could last in the beginning. He was completely different from the pros around him with their terrifying hand speed.
However, normal players didn't have any right to mock him for it.
