Lots of comments obviously focus on the issue whether this is truth or slander. There is another angle to this:

A word of advice for new people in OSS. You do not need to go to conferences to be successful in the field. Many of the developers who actually write code do not attend conferences.

On the other hand, people who want to associate themselves with the work of others, narcissists, activists of all kinds, parasites and a lot more are to be found in the conference circuits. There are some legit people as well but you'll also find them online where the work happens.