Well I think the only problem with the title is that "harassment" is not a strong enough word.
About using the word "community", the first paragraph of the open letter explains why it's relevant:
"We, the undersigned, have become aware that, for some time, Jon Pretty has abused his position of privilege and stature within the Scala community to sexually harass and victimize women. He has used the community’s conferences to target women who are new to the Scala community, offering mentorship, access, and other forms of support, and then abusing the trust that he has established."
About using the word "community", the first paragraph of the open letter explains why it's relevant:
"We, the undersigned, have become aware that, for some time, Jon Pretty has abused his position of privilege and stature within the Scala community to sexually harass and victimize women. He has used the community’s conferences to target women who are new to the Scala community, offering mentorship, access, and other forms of support, and then abusing the trust that he has established."