I was typing up a reply to a post, and after hitting the “reply” button and this popped up.
It sent me back to my message and after clicking it a couple more times (and getting the error each time), it finally worked.
I can’t tell you if you actually made too many requests. The only people who could tell you that are the WK developers who can look into log files etc. (EDIT: I meant Discourse developers).
The only thing I mentioned was that in HTTP parlance, Error 429 means “Too Many Requests”. That’s just a standard set by the W3C, I think. Whether software developers use the error code 429 as it was intended is another matter.