I looked up Helmuth’s original tweet and it seems like a reasonable one sentence summary of the paper to me. I think the problems here are (i) twitter being twitter (not a great venue for detail and nuance) and (ii) a paper reporting its results in an overly sensational way. If there absolutely definitely aren’t more than two sexes in a given species, don’t say that there “effectively” are.

It's how she reacted to scientists who responded to her tweet politely challenging her assertion that this species has four sexes that is more the issue: doubling down, blocking anyone who disagreed.

An editor of a science magazine should be willing and open to discuss science with scientists. Particularly if they're trying to help correct a misconception.