> This is quite clearly accusing them of being a cult in the sense of Scientology or Jonestown, not in the sense of Britney Spears lovers.

If that were true, I believe you would be able to draw support from the text. You've got quotes there clearly identifying that the author thinks they're a cult, but not a cult in the sense of Scientology or Jonestown (which are/were notable for being coercive, insular, or dangerous).

The quotes identify both are cults. Which, yeah, sure they are. There are a lot of cults. This one has some reasonable points, building an intelligence more intelligent than humans is a hitherto unexplored risk for the species. And none of this means all cults are the same. Unless & until this cult does something bad it isn't in the same camp as the worst cults. And delis-thumbs-7e has a post nearby pointing out that the Britany Spears cultists do actually sleep with each other which I thought was an interesting point.

> As for specific nefarious things that it associates this sex cult with:

This is a list of remarkably mild activities for a cult (more like white collar crimes of opportunity and standard political activism, really, if anything) and an allusion to a different cult, aka the Zizians. And if the Yudowsky people end up like the Zizians they will be the worst type of cult - but if that happened someone has to accuse them of something first.