Could be.
Though 429 error still happening for me as of right now, so is this site still being DDoSed?
Viewing post in Suddenly getting 429 Too Many Requests?
ddos counter measures can have longer side effects. And when I say that 429 does happen occasionally without ddos, read that as: it happened but I did not notice any ddos statement. Might as well have been a ddos every time. But what is a ddos? It is literally what the error message says. Too many requests. That can happen for other reasons as well. Like when there is a sale or some games get viral or whatever.