I will do as you suggest

The crowd did not know what Alex meant by his claims that he had "evolved," and Alex had no intention to tell them the truth; as such, he quickly followed up with a bs claim.

"I reached a new class, and after accepting it, I changed as you see now."

This was partially true; after all, he received a different class when he went through his racial evolution. Because nobody else had experienced a class change, yet they could easily believe his words; after all, people's hair and eye colors were changing daily. Who's to say that the system won't change one's appearance?